Hyperlipoproteinemia Type III
What is Hyperlipoproteinemia type III?
Hyperlipoproteinemia type III is a genetic disorder that causes high levels of cholesterol and triglycerides in your blood. This condition happens when you inherit two copies of a specific version of the ApoE gene, called the epsilon 2 allele. Your body struggles to clear certain types of fat particles from your bloodstream.
This rare condition affects about 1 in 10,000 people. It usually appears in adulthood, often in your 30s or 40s. The buildup of fats in your blood can lead to deposits in your arteries and skin. Early detection through genetic testing helps you take steps to protect your heart health.
Unlike more common types of high cholesterol, hyperlipoproteinemia type III has a distinct genetic cause. It responds well to treatment when caught early. Understanding your ApoE genotype gives you clear information about your risk and helps guide your treatment plan.
Symptoms
- Yellow or orange deposits on your skin, especially on elbows, knees, hands, and buttocks
- Yellow creases in the palms of your hands
- Chest pain or discomfort related to heart disease
- Numbness or pain in your legs when walking
- Early signs of heart attack or stroke
- High cholesterol readings that don't respond to standard treatments
Many people with this condition have no symptoms in the early stages. The first sign is often abnormal blood fat levels found during routine testing. Visible skin deposits may appear later as the condition progresses.
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Causes and risk factors
Hyperlipoproteinemia type III is caused by inheriting two copies of the epsilon 2 variant of the ApoE gene, one from each parent. However, genetic risk alone is not enough. Additional factors like being overweight, having diabetes, low thyroid function, or kidney disease often trigger symptoms. Without these additional factors, many people with the genetic variant never develop the full condition.
Risk factors that can trigger or worsen this condition include obesity, a diet high in saturated fats, lack of physical activity, excessive alcohol use, and poorly controlled diabetes. Hypothyroidism and menopause in women can also activate the disorder. Men tend to develop symptoms earlier than women, typically in their 30s compared to after menopause for women.
How it's diagnosed
Doctors diagnose hyperlipoproteinemia type III through a combination of blood tests and genetic testing. A lipid panel shows unusually high levels of both cholesterol and triglycerides. A specific pattern appears where VLDL cholesterol levels are abnormally elevated. The most definitive test is ApoE genotype testing, which identifies whether you carry two copies of the epsilon 2 allele.
Rite Aid offers ApoE genotype testing as an add-on to our preventive health panel. This genetic test reveals your specific ApoE variant and helps identify your risk for this rare condition. Early testing is valuable if you have unusual cholesterol patterns, a family history of early heart disease, or visible fatty deposits on your skin.
Treatment options
- Follow a heart-healthy diet low in saturated fats, trans fats, and refined carbohydrates
- Maintain a healthy weight through regular physical activity and portion control
- Limit alcohol consumption, which can raise triglycerides
- Exercise regularly, aiming for at least 150 minutes of moderate activity per week
- Take fibrate medications, which are especially effective for this type of high cholesterol
- Use statins if prescribed by your doctor to lower LDL cholesterol
- Treat underlying conditions like diabetes or hypothyroidism that worsen symptoms
- Work with a registered dietitian who specializes in lipid disorders
- Monitor your lipid levels regularly to track treatment progress
- Avoid smoking, which increases cardiovascular risk
Need testing for Hyperlipoproteinemia type III? Add it to your panel.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
This condition has a specific genetic cause involving the ApoE gene and affects both cholesterol and triglycerides equally. Regular high cholesterol usually results from diet and lifestyle factors without this genetic component. Hyperlipoproteinemia type III also responds differently to medications, with fibrates being particularly effective.
Yes, many people with two copies of the epsilon 2 allele never develop the full condition. Additional triggers like obesity, diabetes, or thyroid problems are usually needed to activate symptoms. This is why genetic testing combined with lifestyle management is so valuable for prevention.
ApoE genotype testing requires a simple blood draw. The lab analyzes your DNA to identify which versions of the ApoE gene you inherited. Results typically take 1 to 2 weeks and reveal whether you have the epsilon 2, epsilon 3, or epsilon 4 variants.
These deposits are called xanthomas and are made of cholesterol that has accumulated under your skin. They appear as yellow or orange bumps, often on elbows, knees, hands, and buttocks. Xanthomas are a visible sign that your blood fat levels are very high and need treatment.
Yes, this condition responds very well to treatment when detected early. Fibrate medications combined with lifestyle changes can often bring cholesterol and triglyceride levels to normal ranges. Many people see significant improvement within weeks of starting appropriate treatment.
Your children will inherit one copy of your ApoE gene, but they need two epsilon 2 copies to be at risk. If your partner also carries an epsilon 2 allele, there is a chance your child could inherit two copies. Genetic counseling can help you understand your family's specific risk.
If you carry two epsilon 2 alleles, check your lipid levels at least once a year or more often if recommended by your doctor. Regular monitoring helps catch any changes early. You should also retest whenever you have major health changes like weight gain or a new diagnosis of diabetes.
Diet is extremely important but often not sufficient on its own for this genetic condition. Most people need medication, particularly fibrates, combined with dietary changes. A low-fat diet focusing on whole foods, vegetables, and lean proteins supports medical treatment and improves outcomes significantly.
Untreated hyperlipoproteinemia type III significantly increases your risk of early heart disease, heart attack, and stroke. The abnormal fat particles in your blood can build up in artery walls. With proper treatment, you can reduce this risk to near-normal levels and protect your long-term heart health.
Yes, ApoE genotype testing is valuable if your cholesterol and triglycerides are both high and don't respond well to standard treatments. It is also helpful if you have xanthomas, a family history of early heart disease, or unusual lipid patterns. Knowing your genotype helps your doctor choose the most effective treatment approach.