Child High Cholesterol: What Does It Mean and What Happens Next?

High cholesterol in a child means a blood test found more cholesterol, usually LDL ("bad") cholesterol, than expected for a child. It rarely causes symptoms, but over many years it can contribute to narrowed arteries. Common causes are diet, low activity and extra weight; an inherited condition called familial hypercholesterolaemia (FH) is another important cause.

One result is a starting point. Doctors usually repeat the test, look at the whole lipid profile, and ask about family history before deciding what it means. This guide is for parents and carers. It explains the steps that usually follow but cannot interpret your child's own result.

For adult-focused detail on LDL cholesterol and lipoprotein(a), see the separate guides on high LDL cholesterol and high lipoprotein(a).

The NHS says high cholesterol does not usually cause symptoms, so a high result on its own is not an emergency. Get urgent help for a child who is unwell, whatever their cholesterol result. The NHS advises calling 999 (or your local emergency number) if a child has difficulty breathing, grunting or very fast breathing; is drowsy and hard to wake or not responding normally; has blue, grey or very pale skin; has a fit; or has a rash that does not fade when pressed with a glass.

Book a prompt (non-emergency) appointment if you notice yellowish bumps on the skin, eyelids, knuckles, elbows or knees, or a swollen or painful Achilles tendon. The CDC and MedlinePlus describe these cholesterol deposits as possible signs of FH. They are uncommon in children and need assessment rather than home treatment.

In the United States, the American Academy of Pediatrics (AAP) recommends that all children have a cholesterol test between 9 and 11 years of age. NHLBI guidance says screening for young people begins at ages 9 to 11 and is repeated every 5 years. Other countries may not test all children, so ask what applies where you live.

Earlier testing, possibly from age 2, may be offered when:

• a parent or grandparent has high cholesterol, heart problems, a heart attack or stroke, especially at a young age;
• a relative has been diagnosed with FH;
• the family history is unknown, for example after adoption;
• the child has high blood pressure, diabetes or obesity.

The AAP's patient site gives these bands for children and teens, in mg/dL: total cholesterol is acceptable below 170, borderline at 170 to 199 and high above 200; LDL cholesterol is acceptable below 110, borderline at 110 to 129 and high above 130. Labs and countries may use different ranges and units such as mmol/L, so check the range printed on your child's report and ask the doctor how it applies at your child's age.

The CDC lists an LDL cholesterol over 160 mg/dL in children as a main sign that FH should be considered. Even then, the result has to be confirmed and interpreted with the family history.

FH is an inherited condition in which the body cannot clear LDL cholesterol from the blood properly, so levels are high from birth. MedlinePlus estimates it affects about 1 in 200 to 1 in 250 people, and the AAP says about 1 in 250 children. Most forms are passed down in a dominant pattern, which means one altered gene from one parent is enough to cause it.

FH matters because high LDL cholesterol from early life raises the risk of heart disease at a young age. The CDC says finding and treating FH early can greatly reduce that risk. Lifestyle changes alone are often not enough for FH.

Rarely, a child inherits FH from both parents. MedlinePlus explains that this more severe form usually appears in childhood.

When FH is suspected, a doctor may repeat the lipid test, check for other causes and refer for genetic counselling and testing. If a gene change is found, the CDC explains that family members can be tested for the same change. This approach, often called cascade screening, can find parents, brothers, sisters and other relatives who also need care.

Screening can also work the other way: a child's high result may be the first clue that a parent has FH. Doctors may ask parents to have their own cholesterol checked.

Referral practices vary by country. Situations where doctors commonly consider genetic testing or specialist input include a very high or repeatedly high LDL result, a known FH diagnosis in the family, a strong history of early heart disease, cholesterol deposits on the skin or tendons, or a result that does not improve with lifestyle changes.

Before deciding a child has FH, doctors often look for other causes. NHLBI lists conditions such as hypothyroidism, chronic kidney disease, diabetes and obesity, and medicines including steroids and retinoids, that can raise cholesterol. Do not stop or change any prescribed medicine without talking to the prescriber.

The CDC notes that a child diagnosed with FH may need statin treatment, often starting by age 8 to 10. Whether and when to start is a decision for the child's specialist team.

Healthy habits help every child and are part of care even when medicine is needed. The AAP suggests the whole family focus on:

• plenty of fruit, vegetables, beans, pulses and other fibre-rich foods;
• healthy proteins, including low-fat dairy;
• fewer ultra-processed foods and snacks;
• about an hour of active play or exercise each day for children over 6;
• a healthy weight for the child's age and height, good sleep and managing stress.

Taking a written family history of cholesterol, heart attacks and strokes, with ages, can make the visit more useful.

• Was this a fasting or non-fasting test, and does it need repeating?
• Which part of the lipid profile is high, and how does it compare with the range for my child's age?
• Could another condition or a medicine be raising it?
• Do you think FH is possible, and should my child or our family have genetic testing?
• Should parents, brothers or sisters have their cholesterol checked?
• Is referral to a specialist or lipid clinic needed, and when?
• What changes at home should we focus on first, and when will we recheck?

On SameCase, parents can read de-identified cases from other families and see how verified doctors discussed similar cholesterol results and family histories. This can help you notice questions you had not thought to ask. It cannot tell you whether your child has FH or what treatment they need; that remains with your child's own doctors.