Familial hypercholesterolemia

What is Familial hypercholesterolemia?

Familial hypercholesterolemia is a genetic condition that causes very high cholesterol levels from birth. People with this disorder inherit a gene mutation that prevents their body from removing LDL cholesterol from the blood properly. LDL is the type of cholesterol that can build up in arteries and cause heart problems.

This condition affects about 1 in 250 people, making it one of the most common inherited disorders. Because cholesterol levels are high from a young age, people with familial hypercholesterolemia face a much higher risk of heart disease early in life. Without treatment, men often develop heart disease in their 40s or 50s, and women in their 50s or 60s.

The good news is that early detection and treatment can dramatically reduce heart disease risk. Regular monitoring and a proactive approach to managing cholesterol can help people with this condition live long, healthy lives.

Direct LDL

Measures LDL cholesterol directly
Helps assess heart disease risk
Important for managing cholesterol levels

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Symptoms

Cholesterol deposits in tendons, especially around the ankles and knuckles
Yellow deposits around the eyelids called xanthelasmas
White or gray ring around the cornea of the eye before age 45
Chest pain or angina in younger adults
Fatty deposits under the skin, particularly on elbows or knees
Family history of early heart attacks or strokes

Many people with familial hypercholesterolemia have no obvious symptoms until they develop heart disease. Children and young adults often show no visible signs. This is why family history and cholesterol screening are so important for early detection.

Causes and risk factors

Familial hypercholesterolemia is caused by mutations in genes that help remove LDL cholesterol from the blood. The most common mutations affect the LDL receptor gene, which normally pulls cholesterol out of circulation. When this gene does not work properly, cholesterol accumulates in the bloodstream. This condition is inherited in an autosomal dominant pattern, meaning you only need one copy of the mutated gene from one parent to develop the disorder.

Risk factors include having a parent with very high cholesterol or early heart disease. If one parent has the mutation, each child has a 50% chance of inheriting it. In rare cases, a person inherits mutations from both parents, causing a severe form with cholesterol levels three to six times higher than normal. Lifestyle factors like diet and exercise do affect cholesterol levels, but they cannot cause or cure this genetic condition.

How it's diagnosed

Diagnosis typically begins with a lipid panel blood test that measures LDL cholesterol levels. Adults with LDL levels above 190 mg/dL or children with levels above 160 mg/dL may have familial hypercholesterolemia, especially if they have a family history of high cholesterol or early heart disease. Your doctor will also look for physical signs like cholesterol deposits on the skin or eyes.

Genetic testing can confirm the diagnosis by identifying specific gene mutations. This testing helps determine which family members may be at risk and need screening. Talk to your doctor about specialized genetic testing and lipid panels. Our Direct LDL test can help monitor cholesterol levels, but genetic testing is needed for definitive diagnosis of this inherited condition.

Treatment options

Statin medications to lower LDL cholesterol, often started in childhood
PCSK9 inhibitors for people who need additional cholesterol reduction
Ezetimibe to reduce cholesterol absorption in the intestines
Heart-healthy diet low in saturated fat and trans fats
Regular physical activity, aiming for 150 minutes per week
Avoiding smoking and limiting alcohol consumption
Regular monitoring of cholesterol levels every 3 to 6 months
Heart disease screening including stress tests or calcium scoring
Family screening to identify other relatives who may have the condition

Frequently asked questions

Familial hypercholesterolemia is a genetic condition you are born with that causes very high cholesterol from birth. Regular high cholesterol usually develops later in life due to diet, lifestyle, and aging. People with the genetic form have much higher LDL levels and develop heart disease at younger ages, often despite healthy lifestyle habits.

Children with a family history of very high cholesterol or early heart disease should be tested between ages 2 and 10. Earlier testing helps identify the condition when treatment can prevent heart damage. The American Academy of Pediatrics recommends universal cholesterol screening for all children between ages 9 and 11.

Diet and exercise alone cannot cure this genetic condition, but they are important parts of treatment. Healthy lifestyle habits can lower cholesterol by 10 to 20%, which helps when combined with medication. Most people with familial hypercholesterolemia need medication to reach safe cholesterol levels and prevent heart disease.

Adults with LDL cholesterol above 190 mg/dL without other causes may have this condition. Children with LDL above 160 mg/dL are also suspect, especially with a family history. Total cholesterol above 300 mg/dL in adults or 250 mg/dL in children can also be warning signs.

Genetic testing is not always required but helps confirm the diagnosis and identify the specific mutation. Doctors can diagnose the condition based on very high cholesterol levels, family history, and physical signs. Genetic testing is most useful for screening family members and making treatment decisions in complex cases.

Untreated familial hypercholesterolemia leads to cholesterol buildup in arteries starting in childhood. This causes heart attacks in men as early as their 30s or 40s, and in women in their 50s or 60s. The risk of premature heart disease is 20 times higher than in people without the condition.

Yes, because this is an inherited condition, all first-degree relatives should be tested. This includes parents, siblings, and children. Each child of someone with familial hypercholesterolemia has a 50% chance of inheriting it. Early detection in family members allows treatment to begin before heart damage occurs.

Statins are the first-line treatment and can lower LDL by 30 to 50%. Many people also need additional medications like ezetimibe or PCSK9 inhibitors. PCSK9 inhibitors are particularly effective, lowering LDL by an additional 50 to 60% when added to statins. Combination therapy often brings cholesterol to target levels.

Yes, but pregnancy requires special planning and monitoring. Most cholesterol-lowering medications must be stopped before and during pregnancy because they can harm the developing baby. Women should work closely with their cardiologist and obstetrician to manage cholesterol safely. Treatment can resume after pregnancy and breastfeeding.

Most people need cholesterol testing every 3 to 6 months when starting or adjusting treatment. Once cholesterol levels are stable at target, testing every 6 to 12 months is usually sufficient. Your doctor may recommend more frequent monitoring based on your specific situation and treatment response.