Are High Triglycerides Genetic? What Research on Genes, Pancreatitis Risk, Testing and New apoC-III Drugs Shows

A calm gray-haired man in a sage green top smiles softly beside a sunlit window. Metabolic and Hematologic Genetic Diseases
  1. Are High Triglycerides Genetic? What Research on Genes, Pancreatitis Risk, Testing and New apoC-III Drugs Shows
  2. What triglycerides are and what the numbers mean
  3. How genes shape triglycerides: many small effects vs one rare gene
    1. The genes behind the “scissors”
    2. Three kinds of genetic background
    3. What the numbers show
    4. Large gene maps
  4. Risk magnitude: heart disease and the pancreatitis threshold
    1. The heart story
    2. The pancreatitis story
  5. Testing options: lipid panel, clinical genetic testing and the 23andMe report
    1. Start with the blood test
    2. When clinical genetic testing comes up
    3. What the 23andMe Triglycerides report is
    4. Finding a genetic counselor
  6. Interpreting results: polygenic score vs pathogenic variant vs VUS
    1. A polygenic result
    2. A pathogenic variant
    3. A VUS
    4. The blood level still leads
  7. Prevention and management: what lowers triglycerides and when medicines are added
    1. Lifestyle is the foundation
    2. When levels are very high
    3. Medicine classes doctors use
    4. Questions to ask your doctor
  8. The apoC-III era: olezarsen and plozasiran
    1. Why apoC-III is a target
    2. What the trials found
    3. Safety and what is still unknown
    4. Approval status as of October 2026
  9. Family implications and psychosocial issues: relatives, GINA and insurance
    1. What it means for your relatives
    2. Talking with family
    3. Genetic discrimination laws
  10. Frequently asked questions
    1. Do high triglycerides mean pancreatitis will happen?
    2. Will children inherit high triglycerides from a parent?
    3. Can a genetic result affect health or life insurance?
    4. Can an employer find out or use a genetic result?
    5. Is a second opinion worth getting?
  11. Summary
  12. References

Are High Triglycerides Genetic? What Research on Genes, Pancreatitis Risk, Testing and New apoC-III Drugs Shows

This article is for educational purposes only. It is not a substitute for advice from a licensed physician, board-certified medical geneticist, or board-certified genetic counselor. For any decisions about testing, treatment, or care, consult a qualified clinician. In emergencies, call 911.

Ken
Ken

My dad has had high triglycerides for years. Now my own blood test came back high, and I keep wondering if it runs in the family.

The Geneticist
The Geneticist

That is a fair question, and many readers ask it. Family history matters, but the full picture usually involves more than genes, and this article walks through how the pieces fit.

Ken
Ken

If a genetic test gives me a higher-likelihood result, can I even handle that?

The Geneticist
The Geneticist

Many people feel that same hesitation before testing. Nobody has to process a result alone; that is exactly what a genetic counseling session is for, both before and after any test.

Ken
Ken

My wife and I have two young kids. Could they get this from me?

The Geneticist
The Geneticist

That is one of the most important questions to ask. GeneReviews describes checking at-risk relatives with a family variant test or a routine lipid panel, and the right approach depends on the family’s genetic type.

Ken
Ken

OK, so what do I actually do first?

The Geneticist
The Geneticist

The sections ahead cover the path from your primary-care doctor to a lipid specialist or genetic counselor, along with what current US and Canadian guidelines say about tests and treatment.

Bottom line: Research shows that high triglycerides are usually “a little genetic and a lot of other things.” In a Canadian-American study of 563 white (Caucasian) patients with very high levels, only about 1 in 100 had the rare single-gene form. A 2025 review of 2,521 adults found the same pattern: the rare form explained fewer than 5 in 100 cases. Most people carry many small gene effects that add up, and diet, alcohol, weight, diabetes and medicines then push the number higher. Your measured blood level, not a DNA result, guides most care decisions.

What you’ll learn

  • What the triglyceride numbers mean, in both mg/dL and mmol/L
  • How many small gene effects differ from one rare gene change, and why that matters
  • What a 23andMe Triglycerides result can and cannot tell you
  • What the new apoC-III injections are approved for, as of October 2026

What triglycerides are and what the numbers mean

Ken
Ken

My lab report just says “triglycerides: high.” What are they, exactly?

The Geneticist
The Geneticist

That is a very common first question. MedlinePlus from the US National Library of Medicine groups results from normal, below 150 mg/dL, up to very high, at 500 mg/dL or more.

Triglycerides are the most common type of fat in your blood. Your body stores extra calories as triglycerides and burns them later for energy. They travel in the blood inside tiny fat-carrying particles. Some particles come from the liver. Others, called chylomicrons, carry fat from the food you just ate.

An enzyme called lipoprotein lipase, or LPL, clears these particles. Think of LPL as a pair of scissors on the walls of blood vessels. It snips fat out of the particles so muscles and fat tissue can use it. When the scissors work slowly, triglycerides pile up in the blood.

MedlinePlus, the plain-language health site of the US National Library of Medicine, groups results like this:

Category US labs (mg/dL) Canadian labs (mmol/L, approx.)
Normal Less than 150 Less than 1.7
Borderline high 150 to 199 1.7 to 2.2
High 200 to 499 2.3 to 5.6
Very high 500 and above 5.6 and above

To convert, divide mg/dL by about 88.5. So 150 mg/dL is about 1.7 mmol/L, and 1,000 mg/dL is about 11.3 mmol/L.

MedlinePlus lists many common causes of high triglycerides:

  • Eating more calories than you burn, especially lots of sugar
  • Being overweight
  • Smoking and heavy drinking
  • Certain medicines
  • Thyroid, liver or kidney disease
  • Poorly controlled type 2 diabetes
  • Some genetic disorders

US guidelines also treat a lasting level of 175 mg/dL (about 2.0 mmol/L) or more as a “risk-enhancing factor”. That phrase means it can tip a doctor toward more active heart prevention. The 2018 cholesterol guideline also says screening can use a fasting or nonfasting blood test.

Ken
Ken

My number was flagged once. Should I worry now, or get it rechecked first?

The Geneticist
The Geneticist

Many people sit where you are now. The 2021 ACC pathway counts levels as persistent only if they stay high after 4 to 12 weeks of lifestyle changes, so ask your primary-care doctor about a repeat test.

Triglycerides change a lot from day to day. A big meal, a few drinks or a recent illness can raise them. One flagged result is a reason to repeat the test, not a final verdict. The 2021 American College of Cardiology (ACC) pathway uses the word “persistent” with care. Levels count as persistent only if they stay high after 4 to 12 weeks of lifestyle changes and treatment of other causes.

Canada’s 2021 guideline uses mmol/L throughout. When triglycerides are above 1.5 mmol/L (about 133 mg/dL), it prefers other blood markers for heart-risk screening. These are non-HDL cholesterol (all the “bad” cholesterol types added together) or apolipoprotein B (a count of harmful particles). Ask your doctor which number your lab report uses.

Section recap: Normal triglycerides are below 150 mg/dL (1.7 mmol/L), and 500 mg/dL (5.6 mmol/L) or more is very high. One high result usually calls for a repeat test and a talk with your primary-care doctor.

How genes shape triglycerides: many small effects vs one rare gene

Ken
Ken

Since my dad has it, is this basically one bad gene that I either got or didn’t?

The Geneticist
The Geneticist

That is a very natural way to think about it. In a Canadian-American study of 563 patients with severe levels, only about 1 in 100 had the rare two-copy form, while many small gene effects were far more common.

The genes behind the “scissors”

Several genes control how well LPL works. Some act like helpers. One acts like a brake.

Gene What its protein does Effect when it does not work well
LPL The “scissors” enzyme that clears fat Triglycerides build up
APOC2 Switches LPL on Triglycerides build up
APOA5 Helps LPL work Triglycerides build up
GPIHBP1 Holds LPL in place on vessel walls Triglycerides build up
LMF1 Helps LPL fold into its working shape Triglycerides build up
APOC3 Makes apoC-III, a brake on fat clearing Lower triglycerides (less brake)

The first five genes were screened in a key Canadian-American study. APOC3 is different. When APOC3 does not work, the brake is weaker, so triglycerides fall.

Three kinds of genetic background

Researchers describe three situations. Readers often mix them up.

Situation What it means How common in severe cases
Polygenic (many genes) Many common gene differences, each with a tiny effect, add up Most people with high levels
One rare large-effect change One copy of a strong variant, for example in LPL or APOA5, raises risk Some people; usually needs a “second hit”
Familial chylomicronemia syndrome (FCS) Both copies of a key gene are broken Rare: about 1 to 5 in 100 severe cases

FCS is autosomal recessive. That means a person is affected only if they get a broken copy from each parent. People with one broken copy are called carriers. Carriers often have normal or mildly raised levels.

What the numbers show

Dron and colleagues studied 563 patients with severe high triglycerides. All were white (Caucasian), from Ontario and California. The team sequenced 73 genes and looked at 185 common variants.

Finding (Dron 2019, Caucasian patients only) Share of patients
Both copies broken (the FCS-type form) 1.1% (about 1 in 100)
One copy of a rare strong variant 14.4%
Very high polygenic score (many small variants) 32.0%
Total “polygenic” form 46.3% (about 46 in 100)
No genetic cause found with this panel 52.6% (about 53 in 100)

Patients were 5.77 times more likely than healthy controls to carry one of these genetic patterns. Because every patient in this study was Caucasian, these exact percentages may not fit other groups.

A 2025 systematic review pooled 10 studies of 2,521 adults with levels of 500 mg/dL or more. A systematic review collects and compares all the studies it can find on one question. It found FCS in fewer than 5 in 100 cases. People with FCS had extreme levels, above 2,800 mg/dL, and more than 70 in 100 had pancreatitis. The polygenic form made up about 70 to 80 in 100 cases.

The review also found that fatty liver disease was very common in polygenic cases. The authors describe a “two-hit” model. Genes load the dice, and things like weight, sugar, alcohol or diabetes roll them.

Ken
Ken

How would I even know which genetic picture fits my family?

The Geneticist
The Geneticist

That sorting is hard to do alone. A 2025 review of 2,521 adults found the rare FCS form in fewer than 5 in 100 severe cases, so ask your doctor or a genetic counselor whether your family history points that way.

Large gene maps

The Global Lipids Genetics Consortium studied about 1.65 million people. This kind of whole-genome scan is called a genome-wide association study. It found many common gene differences linked to blood fats. Each one nudges levels a tiny bit. About 350,000 participants had non-European ancestry. Adding more diverse people made gene-based predictions work better across groups.

Section recap: High triglycerides are usually polygenic, meaning many small gene effects plus lifestyle and health factors. The rare FCS form needs two broken gene copies, and a genetic counselor can help sort out which picture fits your family.

Risk magnitude: heart disease and the pancreatitis threshold

Ken
Ken

I’ve heard high triglycerides can wreck your pancreas. Is that what I should fear most?

The Geneticist
The Geneticist

Many people focus on that first. A Danish study of 116,550 adults found pancreatitis risk rose with triglycerides, yet even in the highest group, heart attacks were about 6 times more common than pancreatitis.

High triglycerides raise two different questions. One is about the heart. The other is about the pancreas, an organ behind the stomach that makes digestive juices. For most people with mildly high levels, the heart question matters more.

The heart story

Gene studies give strong clues. A 2014 study sequenced the genes of 3,734 people. About 1 in 150 people carried a rare change that switched off one copy of APOC3. These carriers had 39% lower triglycerides than noncarriers. They also had 40% lower risk of coronary heart disease. This was found among 498 carriers and more than 110,000 noncarriers.

This suggests that lifelong lower apoC-III and triglycerides help protect the heart. It does not prove that lowering triglycerides with a drug prevents heart attacks.

Two big drug trials point in different directions:

Trial Who joined Result on heart events Absolute difference
REDUCE-IT (icosapent ethyl, funded by Amarin) 8,179 people on statins with heart disease or diabetes, TG 135 to 499 mg/dL 17.2% vs 22.0% over about 5 years About 5 fewer people per 100 had an event
PROMINENT (pemafibrate) 10,497 people with type 2 diabetes, TG 200 to 499 mg/dL 572 vs 560 patients had an event No benefit; about 11 in 100 in each group

Pemafibrate lowered triglycerides by about 26% but did not reduce heart events. REDUCE-IT patients had more hospital stays for an irregular heartbeat, 3.1% vs 2.1%. Experts still debate why REDUCE-IT worked. So it is not settled that lowering triglycerides by itself protects the heart.

The pancreatitis story

Very high triglycerides can cause acute pancreatitis. This is a sudden, painful swelling of the pancreas that often needs a hospital stay. The ACC calls 500 mg/dL (5.6 mmol/L) or more “severe,” and especially 1,000 mg/dL (11.3 mmol/L) or more.

A Danish study followed 116,550 adults for about 7 years. Pancreatitis risk climbed step by step as triglycerides rose.

Nonfasting triglycerides Pancreatitis per year Heart attack per year
Below 89 mg/dL (1 mmol/L) Lowest group (comparison) Not shown here
443 mg/dL (5 mmol/L) or more About 1 in 1,000 people About 8 in 1,000 people

People in the top group were 8.7 times more likely to get pancreatitis than the lowest group. That sounds large. In plain numbers, though, it means about 12 cases per 10,000 people each year. In the same group, heart attacks were about 6 times more common than pancreatitis.

Ken
Ken

At what number should I stop waiting and call my doctor right away?

The Geneticist
The Geneticist

That is a sensible thing to pin down. The 2021 ACC pathway calls 500 mg/dL (5.6 mmol/L) or more severe, especially 1,000 mg/dL (11.3 mmol/L) or more, so levels in that range deserve prompt follow-up with your primary-care doctor.

The picture is very different at extreme levels. In the 2025 review, more than 70 in 100 people with FCS had had pancreatitis. In the olezarsen trials, among high-risk patients on placebo, about 29 in 100 had an attack within a year.

Section recap: For most people, high triglycerides are mainly a heart-risk question, and drug trials on that question disagree. Pancreatitis risk climbs sharply at very high levels, so levels of 500 mg/dL (5.6 mmol/L) or more need prompt medical follow-up.

Testing options: lipid panel, clinical genetic testing and the 23andMe report

Ken
Ken

Should I just get a DNA test to find out if this is genetic?

The Geneticist
The Geneticist

That is a common instinct. The ACC pathway puts checking secondary causes first, such as diabetes, kidney disease, alcohol and some medicines, so a repeat lipid panel and that review usually come before any genetic test.

Start with the blood test

The first test is a standard lipid panel, which measures cholesterol and triglycerides together. Insurance or provincial plans usually cover it when a doctor orders it. If your result is high, your doctor may repeat it after fasting.

The ACC pathway lists other conditions and habits that raise triglycerides. Doctors call these “secondary causes.” They include:

  • Diabetes and metabolic syndrome
  • Chronic kidney disease
  • Pregnancy
  • Inflammatory diseases
  • High alcohol intake
  • Diets high in saturated fat
  • Some medicines, such as beta-blockers, diuretics (water pills), estrogens, steroids and some HIV drugs

Your doctor may check your thyroid, blood sugar, kidneys and liver. Never stop a prescribed medicine on your own. Ask your doctor first.

When clinical genetic testing comes up

A clinical genetic test looks for broken copies of genes such as LPL, APOC2, APOA5, GPIHBP1 and LMF1. Doctors usually consider it when a person has:

  • Very high levels since childhood
  • Repeated pancreatitis
  • Levels that stay extreme despite treatment
  • Signs that suggest FCS

GeneReviews, an expert medical reference hosted by NIH, describes the most common FCS gene form. This is LPL deficiency, and it usually shows up in childhood. Signs include belly pain, repeated pancreatitis and small yellow skin bumps. About 1 in 4 affected children have symptoms before age 1. A diagnosis is made when testing finds both copies of LPL broken.

What the 23andMe Triglycerides report is

The 23andMe Health Predisposition report on triglycerides is a polygenic estimate. The company says it uses more than 7,400 gene variants. It adds up many small effects into one likelihood score. The company lists several ancestry groups it applies to.

Here is what that report is not:

  • It is not a diagnosis.
  • It is not a test for FCS or other rare single-gene causes.
  • It is not a replacement for a blood test.

This company page is product information, not proof that the report is clinically useful. Bring the report to your doctor, but let your blood level lead the conversation.

Test What it measures What it can tell you
Lipid panel Fat levels in your blood today Your actual triglyceride level
Clinical genetic panel Rare variants in LPL-pathway genes Whether FCS or a strong single variant is present
23andMe polygenic report Thousands of common small variants A rough likelihood, not a diagnosis
Ken
Ken

I already have a 23andMe report. Is it worth bringing to my appointment?

The Geneticist
The Geneticist

You can bring it. The company describes it as a polygenic estimate from more than 7,400 variants, not a test for FCS, so let your blood level lead and ask your doctor about a genetic counselor referral if needed.

Finding a genetic counselor

A genetic counselor is a trained health professional who explains genetic tests and results. In the US, genetic counselors are certified by the American Board of Genetic Counseling (ABGC). In Canada, certification is through the Canadian Association of Genetic Counsellors (CAGC). The National Society of Genetic Counselors is a professional society, not a certifying body. Its Find a Genetic Counselor directory can help you find someone near you.

Section recap: A lipid panel and a check for other causes come first. Clinical genetic testing is for suspected FCS or extreme cases, and a 23andMe report is only a rough likelihood to discuss with your doctor.

Interpreting results: polygenic score vs pathogenic variant vs VUS

Ken
Ken

Polygenic, pathogenic, VUS… these report words confuse me. Which one is the scary one?

The Geneticist
The Geneticist

Those terms trip up many people. A polygenic score only shifts the odds, while GeneReviews explains that finding both LPL copies broken confirms LPL deficiency, a form of FCS.

A genetic result can fall into one of three main types. Each one means something different.

Result type What it means What usually happens next
Polygenic “increased likelihood” You carry more small-effect variants than average Read it alongside your blood level
Pathogenic or likely pathogenic variant A change known or very likely to break a gene Two broken copies support FCS; one copy means higher risk
VUS (variant of uncertain significance) A change whose effect is not yet known Do not change care based on it alone

A polygenic result

A polygenic score shifts the odds. It does not decide your fate. In the Dron study, more than half of patients had no genetic cause found. So a “typical likelihood” result does not cancel a high lab value.

Scores also work better for some groups than others. Most early lipid gene studies used people of European ancestry. The large 2021 gene study found that adding diverse participants made predictions work better. If your ancestry is not mainly European, the score may be less accurate for you.

Ken
Ken

My family isn’t of European background. Does a polygenic score even apply to me?

The Geneticist
The Geneticist

That is a fair question. A 2021 study of about 1.65 million people found that adding diverse participants made predictions work better, so ask a genetic counselor how well a score fits your ancestry.

A pathogenic variant

A pathogenic variant is a gene change known to cause disease. If testing finds two broken LPL copies, that confirms LPL deficiency, a form of FCS. If testing finds only one copy, you are a carrier. GeneReviews notes that carriers are more likely to have high triglycerides. It is like a car with one weak brake line: it still runs, but stress shows the weakness sooner.

A VUS

A VUS is a gene change scientists cannot yet classify as harmful or harmless. It should not change your care by itself. Labs may reclassify it later as more data come in. Ask your genetic counselor how you will hear about any update.

The blood level still leads

In almost every case, your measured triglyceride level drives treatment. Genetics adds context. It can explain why your level runs high, or why relatives share the pattern. A lipid specialist or genetic counselor can put the pieces together for you.

Section recap: A polygenic score is a probability, a pathogenic variant can confirm FCS, and a VUS should not change care on its own. Your blood level remains the main guide, so review any result with a clinician.

Prevention and management: what lowers triglycerides and when medicines are added

Ken
Ken

If it’s in my genes anyway, does changing my diet even matter?

The Geneticist
The Geneticist

That frustration is very common. US and Canadian guidelines both put lifestyle first, and the ACC pathway lists 150 minutes a week of moderate activity and 5% to 10% weight loss for people who are overweight.

Lifestyle is the foundation

Guidelines in both countries put lifestyle first. This holds even when genes play a role. Genes load the dice, but daily habits still change the roll.

The ACC pathway recommends these steps:

  • See a registered dietitian.
  • Aim for 150 minutes a week of moderate activity, or 75 minutes of vigorous activity.
  • Lose 5% to 10% of body weight if you are overweight.
  • Limit alcohol, especially when triglycerides are very high.
  • Treat other causes, such as diabetes or a thyroid problem.

Canada’s guideline also calls regular exercise and a heart-healthy diet the cornerstone of prevention.

When levels are very high

For severe levels, the ACC summary advises limiting all dietary fat to about 20 to 30 grams a day. At 1,000 mg/dL (11.3 mmol/L) or more, it describes a very-low-fat diet, about 10% to 15% of calories. For LPL deficiency, GeneReviews describes fat intake of 20 grams a day or less. A dietitian should guide these plans, because they are hard to follow alone.

GeneReviews also lists things that can worsen LPL deficiency. These include alcohol, estrogen pills, water pills, some acne and mood medicines, steroids and beta-blockers. Only your doctor should decide whether to change any prescription.

Medicine classes doctors use

Doctors pick medicines based on your overall risk, not just your triglyceride number.

Medicine type Main role What the evidence shows
Statins Lower overall heart risk Part of standard care when indicated
Icosapent ethyl (prescription) Selected high-risk patients on statins About 5 fewer heart events per 100 over about 5 years in REDUCE-IT
Fibrates (e.g., pemafibrate) Lower triglycerides PROMINENT showed no heart benefit
Prescription omega-3 Very high triglycerides Recommended with a very-low-fat diet at 1,000 mg/dL or more

The ACC pathway says adults without heart disease or diabetes, with levels between 150 and 499 mg/dL, usually do not need non-statin triglyceride drugs. It also stresses prescription omega-3 products, not store-bought fish oil.

That difference matters. Over-the-counter fish oil is not the same as a prescription product. For people with LPL deficiency, GeneReviews says fish oil supplements should not be used at all. They can raise triglyceride and chylomicron levels.

Ken
Ken

My dad takes fish oil from the drugstore. Should I just do the same?

The Geneticist
The Geneticist

Many people assume that. The ACC pathway stresses prescription omega-3 over store-bought fish oil, and GeneReviews advises against fish oil in LPL deficiency, so plan any supplement or medicine change with your doctor.

Questions to ask your doctor

  • Is this level high enough to need a repeat test or a specialist?
  • Could a current medicine or another condition be raising it?
  • Would a dietitian or a lipid clinic help?
  • Does the overall heart risk call for a statin or another medicine?

Section recap: Weight, activity, alcohol and diet changes are the base of treatment, even with a genetic background. Medicines depend on overall risk, and store-bought fish oil is not a substitute, so plan any change with your clinician.

The apoC-III era: olezarsen and plozasiran

Ken
Ken

I keep seeing news about new triglyceride shots. What are they, exactly?

The Geneticist
The Geneticist

Plenty of people have seen those headlines. Olezarsen and plozasiran block the making of apoC-III, a brake on fat clearing, and a 2014 gene study found people with one switched-off APOC3 copy had lower triglycerides.

Why apoC-III is a target

Recall that apoC-III acts as a brake on fat clearing. People born with one switched-off APOC3 copy have lower triglycerides and less heart disease. That finding gave drug makers a clear target. Two new drugs block the making of apoC-III in the liver. Both are injections.

  • Olezarsen (brand name Tryngolza) is an antisense drug. It is a short, man-made strand of genetic code that blocks the apoC-III message.
  • Plozasiran (brand name Redemplo) is a small interfering RNA drug. It also silences the apoC-III message, in a slightly different way.

What the trials found

Trial Patients Triglyceride change Pancreatitis Funded by
CORE and CORE2 (olezarsen) 1,061 adults with severe high triglycerides Triglycerides fell about 49% to 72% more than with placebo at 6 months About 5 in 100 on placebo vs fewer than 1 in 100 on the drug Ionis
PALISADE (plozasiran) 75 adults with persistent chylomicronemia About 80% lower vs 17% on placebo at 10 months About 20 in 100 on placebo vs 8 in 100 on 25 mg Arrowhead

The olezarsen pancreatitis numbers come from the FDA label’s combined trial data. In high-risk patients, about 29 in 100 on placebo had an attack, compared with about 4 in 100 on olezarsen. These patients had levels of 880 mg/dL (about 9.9 mmol/L) or more and past pancreatitis.

PALISADE was small, so its pancreatitis numbers are less certain. Its patients started at a median of 2,044 mg/dL. Only about half had a confirmed genetic diagnosis of FCS.

Safety and what is still unknown

Both drugs had side effects in trials. With olezarsen, liver enzyme rises and low platelet counts were more common at the higher dose. Platelets are blood cells that help clotting. Liver fat also rose as the dose went up. With plozasiran, common side effects included belly pain, headache and nausea. Some patients with diabetes or prediabetes had higher blood sugar.

These trials did not test whether the drugs prevent heart attacks or strokes. That question is still open.

Approval status as of October 2026

Regulators record different uses in each country. The table below comes from FDA approval letters and labels, and from Health Canada records.

Drug FDA (US): FCS FDA (US): severe high TG (500 mg/dL or more) Health Canada: FCS Health Canada: severe high TG
Olezarsen (Tryngolza) Approved 2024-12-19 Approved 2026-06-24 Authorized 2025-12-16 Not authorized
Plozasiran (Redemplo) Approved 2025-11-18 Not approved Authorized 2026-01-02 Not authorized

In Canada, plozasiran is for adults with FCS whose standard triglyceride treatment has not worked well enough. Neither drug has a pediatric use authorized in Canada.

Ken
Ken

Could I ask my doctor for one of these shots for my borderline numbers?

The Geneticist
The Geneticist

It is reasonable to ask. As of October 2026, FDA and Health Canada records list both drugs for FCS, plus olezarsen in the US only for levels of 500 mg/dL (5.6 mmol/L) or more. Heart effects were not tested, so ask a lipid specialist.

These are specialist medicines for very high levels. They are not meant for mildly high triglycerides. Insurance and provincial coverage may be limited. Ask your insurer or provincial plan, and talk with a lipid specialist about whether you fit.

Section recap: Olezarsen and plozasiran lower triglycerides sharply and reduced pancreatitis in trials, but their heart effects are untested. Approved uses differ between the US and Canada, so a lipid specialist should guide any decision.

Family implications and psychosocial issues: relatives, GINA and insurance

Ken
Ken

If this is genetic, should I tell my siblings and get my kids checked?

The Geneticist
The Geneticist

That question comes up in many families. GeneReviews explains that in LPL deficiency, the most common genetic form of FCS, each sibling has a 25% chance of being affected when both parents are carriers, so the family plan depends on the genetic type.

What it means for your relatives

The family picture depends on the genetic type.

Genetic type Chance for relatives Practical step
Polygenic Relatives share some genes and often the same habits Siblings and adult children can ask their doctor about a lipid panel
FCS (autosomal recessive) Each sibling has a 25% chance of being affected if both parents are carriers Genetic counseling and family testing
FCS carriers Each sibling has a 50% chance of being a carrier A routine lipid panel can check levels

For FCS, GeneReviews describes the odds for each brother or sister of an affected person. If both parents carry one broken copy, each sibling has a 25% chance of being affected. Each has a 50% chance of being a carrier, and a 25% chance of neither. Think of it as two coin flips, one from each parent.

GeneReviews advises checking at-risk siblings in infancy. Doctors use the family’s known variant plus a triglyceride test. It also suggests a routine lipid panel for close relatives who may be carriers. Testing relatives in a family step by step, once one person’s result is known, is called cascade testing. A genetic counselor can plan the order.

Talking with family

Blame does not help. A simple message works well. Share that your triglycerides are high and that genes may play a part. Then suggest that relatives ask their own doctor about a blood test. This shares useful news without pressure. A genetic counselor can help you plan what to say.

Genetic discrimination laws

Many readers worry about insurance. The rules differ between the US and Canada.

Law What it protects What it does not cover
US GINA (2008) Health insurance and most jobs; insurers cannot use genetic information for coverage or price Life, disability and long-term-care insurance
Canada Genetic Non-Discrimination Act (2017) No one can require a genetic test or its results to provide services or sign a contract Health care providers and researchers are exceptions

In the US, the job rules under GINA are enforced by the Equal Employment Opportunity Commission. Some states add more protection.

Ken
Ken

Could a genetic test hurt my health or life insurance down the road?

The Geneticist
The Geneticist

That worry is very common. US GINA covers health insurance and most jobs but not life, disability or long-term-care insurance, so talk with a genetic counselor, certified by ABGC in the US or CAGC in Canada, before testing.

There is one more key point. A measured triglyceride level is not a genetic test under the Canadian Act’s definition. A blood fat result is a regular medical finding. Before a genetic test, ask a genetic counselor how results may affect life or disability insurance.

Section recap: In FCS, each sibling of an affected person has a 1 in 4 chance of being affected, while polygenic risk calls for simpler family lipid checks. GINA and Canada’s law protect many uses of genetic results, but not all, so ask a counselor before testing.

Frequently asked questions

Do high triglycerides mean pancreatitis will happen?

Not necessarily. In a large Danish study, people with levels of 443 mg/dL or more had pancreatitis at about 1 in 1,000 per year. Risk rises much more at extreme levels and in FCS. Ask your doctor how urgent your level is.

Will children inherit high triglycerides from a parent?

With the common polygenic form, children may share some risk genes and family habits. A lipid panel through their doctor is a sensible step. With FCS, a genetic counselor can explain the odds for siblings and children.

Can a genetic result affect health or life insurance?

In the US, GINA bars health insurers from using genetic information. It does not cover life, disability or long-term-care insurance. In Canada, the 2017 Act limits requiring or using genetic test results in contracts. Check with a genetic counselor before testing.

Can an employer find out or use a genetic result?

GINA protects against genetic discrimination in most US jobs. In Canada, no one can make you take a genetic test or share results as a condition of a contract. Your lipid panel itself is not a genetic test under the Canadian definition.

Is a second opinion worth getting?

Yes, if your levels stay very high, you have had pancreatitis, or treatment is not working. A lipid clinic or a certified genetic counselor can review your case. A second opinion is a normal part of care, not a sign of distrust.

Summary

  • High triglycerides are usually polygenic: many small gene effects plus diet, alcohol, weight, diabetes and medicines.
  • The rare FCS form explains only about 1 to 5 in 100 severe cases. The Dron figures come from Caucasian patients only.
  • For most people, the main concern is heart risk. Drug trials that lower triglycerides show mixed heart results.
  • Pancreatitis risk rises sharply at very high levels, especially 1,000 mg/dL (11.3 mmol/L) or more.
  • A 23andMe Triglycerides report is a likelihood estimate, not a diagnosis, and does not test for FCS.
  • Olezarsen and plozasiran are approved for FCS in the US and Canada. Only olezarsen is approved in the US for severe high triglycerides.
  • Your blood level guides care. Bring your results to your doctor, a lipid specialist or a genetic counselor.

For related topics, see the Metabolic and Hematologic Genetic Diseases category.

This article is for educational purposes only. It is not a substitute for advice from a licensed physician, board-certified medical geneticist, or board-certified genetic counselor. For any decisions about testing, treatment, or care, consult a qualified clinician. In emergencies, call 911.

References

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Last updated: 2026-10-07

Author: Yu Mizuno (Editor-in-Chief, non-physician), GeneLumen editorial team. Editor: Yu Mizuno, a research editor who is not a physician. This article brings together 16 published sources (tier 1 = 10, tier 2 = 5, tier 4 = 1). They include NIH resources (MedlinePlus, NHGRI and GeneReviews), FDA and Health Canada records, and ACC/AHA and Canadian Cardiovascular Society guidelines.

This article is for educational purposes only and is not a substitute for medical advice from a licensed physician, board-certified medical geneticist, or board-certified genetic counselor. In emergencies, call 911 (US/Canada) or 119 (Japan).

🇯🇵 For readers in Japan — a separate Japanese edition written for Japan’s healthcare system (not a translation): https://genelumen.com/ja/ja-metabolic-hematologic-genetic/high-triglycerides-genetics

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