Dysbetalipoproteinemia (Type III Hyperlipoproteinemia)

What is Dysbetalipoproteinemia (Type III Hyperlipoproteinemia)?

Dysbetalipoproteinemia, also called Type III hyperlipoproteinemia, is a rare genetic disorder that affects how your body processes fats. When you have this condition, remnant lipoproteins build up in your blood instead of being cleared normally. Remnant lipoproteins are leftover particles from fat digestion that should be removed by the liver.

This buildup happens because of a genetic variation in a protein called apolipoprotein E, or Apo E. Most people with the genetic variation never develop symptoms. However, when combined with other factors like diet, diabetes, or obesity, it can lead to very high cholesterol and triglyceride levels. This raises your risk for heart disease and stroke significantly.

The condition typically appears in adulthood, often after age 20. It affects roughly 1 in 10,000 people. Because it is rare and symptoms can be subtle, many cases go undiagnosed for years. Early detection through blood testing helps prevent serious cardiovascular problems down the road.

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Symptoms

Yellow fatty deposits on the skin, especially on elbows, knees, and hands
Creamy yellow lines in the palms, called palmar xanthomas
Fatty deposits around the eyes, known as xanthelasma
Chest pain or angina from coronary artery disease
Leg pain when walking due to peripheral artery disease
Enlarged liver or spleen
Pancreatitis with severe abdominal pain

Many people with dysbetalipoproteinemia have no symptoms early on. The condition often goes unnoticed until a routine blood test shows very high cholesterol or triglyceride levels. Some people only discover they have it after developing heart disease or having a cardiovascular event.

Causes and risk factors

Dysbetalipoproteinemia is caused by a genetic variation in the APOE gene. This gene makes apolipoprotein E, a protein that helps clear remnant lipoproteins from your blood. The most common variant is called APOE e2/e2, which about 1 in 100 people carry. However, only 1 to 5 percent of people with this genetic variant actually develop the full condition.

Additional triggers are usually needed to activate the disorder. These include obesity, diabetes, hypothyroidism, kidney disease, excessive alcohol use, and a diet high in saturated fats. Hormonal changes also play a role. Women often develop symptoms after menopause, while men typically show signs earlier in life. Family history of early heart disease or unusual cholesterol patterns can indicate higher risk.

How it's diagnosed

Dysbetalipoproteinemia is diagnosed through blood tests that measure cholesterol, triglycerides, and specific lipoproteins. A key finding is roughly equal levels of total cholesterol and triglycerides, both often above 300 mg/dL. Apolipoprotein B testing helps confirm the diagnosis. People with this condition typically have elevated Apo B levels but a higher Apo B to cholesterol ratio than expected.

Rite Aid offers Apolipoprotein B testing as an add-on to help identify and monitor this rare lipid disorder. Genetic testing for APOE variants can confirm the diagnosis but is not always necessary. Your doctor may also order specialized lipoprotein analysis to look at remnant particles directly. Early diagnosis through regular blood testing is critical for preventing heart disease and stroke.

Treatment options

Follow a low-fat diet with less than 30 percent of calories from fat
Limit saturated fats and avoid trans fats completely
Achieve and maintain a healthy weight through diet and exercise
Exercise regularly, aiming for 150 minutes of moderate activity per week
Limit alcohol consumption or avoid it entirely
Manage underlying conditions like diabetes and hypothyroidism
Take statin medications like atorvastatin or rosuvastatin to lower cholesterol
Use fibrate medications like fenofibrate to reduce triglycerides
Monitor blood lipid levels regularly to track treatment response
Work with a cardiologist or lipid specialist for personalized care

Frequently asked questions

Dysbetalipoproteinemia is a rare genetic disorder where remnant lipoproteins accumulate in your blood. It affects about 1 in 10,000 people and usually appears in adulthood. The condition requires both a genetic variant and additional triggers like obesity, diabetes, or poor diet to become active.

Many people have no early symptoms at all. The first sign is often abnormally high cholesterol and triglyceride levels on a blood test. Some people develop yellow fatty deposits on their skin, especially on the palms, elbows, or around the eyes. Others experience chest pain or leg pain from artery blockages.

Diagnosis involves blood tests showing elevated cholesterol and triglycerides at roughly equal levels. Apolipoprotein B testing helps confirm the diagnosis by showing a high Apo B to cholesterol ratio. Genetic testing for APOE variants can provide additional confirmation but is not always required.

Yes, lifestyle changes are a critical first step in treatment. A low-fat diet, weight loss, regular exercise, and limiting alcohol can significantly improve lipid levels. However, most people also need medication like statins or fibrates. Combining lifestyle changes with medication provides the best results for preventing heart disease.

Standard lipid panels measuring cholesterol and triglycerides are the first step. Apolipoprotein B testing is particularly useful for diagnosis and monitoring treatment. The condition shows elevated Apo B with a characteristic pattern. Specialized lipoprotein analysis can measure remnant particles directly for more detailed assessment.

Yes, untreated dysbetalipoproteinemia significantly raises your risk for heart disease and stroke. The buildup of remnant lipoproteins causes fatty deposits in arteries throughout your body. This can lead to coronary artery disease, peripheral artery disease, and pancreatitis. Early detection and treatment dramatically reduce these risks.

Statin medications like atorvastatin and rosuvastatin are the primary treatment to lower cholesterol. Fibrates like fenofibrate help reduce triglycerides and are often used in combination with statins. Your doctor will choose medications based on your specific lipid levels and cardiovascular risk. Regular monitoring ensures treatment is working effectively.

You cannot prevent the genetic component of dysbetalipoproteinemia. However, you can prevent it from becoming active by maintaining a healthy weight, eating a low-fat diet, exercising regularly, and managing conditions like diabetes. If you have a family history of unusual cholesterol patterns, early blood testing can catch the condition before it causes problems.

After diagnosis, you should get blood tests every 3 to 6 months initially to monitor treatment response. Once your lipid levels are stable, testing every 6 to 12 months is usually sufficient. Your doctor may recommend more frequent testing if medications are adjusted or if other health conditions change.

Yes, the genetic variant that causes dysbetalipoproteinemia is inherited. If you have the condition, your siblings and children may carry the same APOE variant. However, carrying the variant does not guarantee developing symptoms. Family members should consider genetic counseling and regular lipid screening, especially if they have other risk factors.