The only reliable way to know if your cholesterol is high is through a blood test called a lipid panel. High cholesterol produces no noticeable symptoms in the vast majority of people, so you can carry dangerously elevated levels for years without feeling any different. A total cholesterol above 200 mg/dL is generally considered high, but the full picture depends on several numbers working together.
Why You Can’t Feel High Cholesterol
Cholesterol builds up silently inside your blood vessels over time. Unlike high blood pressure, which can occasionally cause headaches or dizziness, high cholesterol gives almost no physical warning signs until it triggers a serious event like a heart attack or stroke. Most people who learn they have high cholesterol are surprised because they felt perfectly fine.
There are rare exceptions. People with a genetic condition called familial hypercholesterolemia, which affects roughly 1 in 220 people worldwide, can develop visible physical signs. These include small fatty deposits called xanthomas on the tendons (especially the Achilles tendon, the backs of the hands, or below the kneecaps) and a whitish-gray ring around the edge of the cornea. The corneal ring is significant only if it appears before age 45. Yellowish patches around the eyelids, called xanthelasmata, are another possible sign but are less specific to cholesterol problems. If you notice any of these, it’s worth getting tested promptly, because familial hypercholesterolemia causes elevated LDL cholesterol from birth and significantly raises the risk of early heart disease if left untreated.
The Blood Test You Need
A lipid panel is a simple blood draw that measures several types of fat in your blood:
- Total cholesterol: A combined measure of all cholesterol in your blood.
- LDL (“bad”) cholesterol: The type that builds up in your blood vessel walls and drives heart disease risk.
- HDL (“good”) cholesterol: This type helps remove LDL from your bloodstream.
- Triglycerides: A fat your body makes from extra calories. Levels rise after eating, and chronically high levels add to cardiovascular risk.
- Non-HDL cholesterol: Your total cholesterol minus your HDL. This captures all the harmful types of cholesterol in a single number and is increasingly considered one of the most useful predictors of heart disease risk.
Your doctor may ask you to fast for 9 to 12 hours before the test, though there’s growing debate about whether fasting is truly necessary. Eating before the test can raise triglycerides by 8% to 19%, which in turn can throw off the calculated LDL number by 4% to 25%. If your doctor orders a non-fasting test, the LDL and triglyceride values may be slightly less precise, but the total cholesterol and HDL readings remain reliable.
What the Numbers Mean
The CDC lists these as optimal cholesterol levels for adults:
- Total cholesterol: Around 150 mg/dL
- LDL cholesterol: Around 100 mg/dL
- HDL cholesterol: At least 40 mg/dL for men, at least 50 mg/dL for women
- Triglycerides: Less than 150 mg/dL
A total cholesterol above 200 mg/dL is considered high for both adults and children. But total cholesterol alone can be misleading. Someone with a total of 210 mg/dL might have that number partly because their HDL is very high, which is actually protective. That’s why looking at each component matters more than fixating on a single number.
One useful shortcut is the cholesterol ratio: divide your total cholesterol by your HDL. If your total is 200 and your HDL is 50, your ratio is 4 to 1. Higher ratios signal higher risk. That said, many clinicians now prefer non-HDL cholesterol (total minus HDL) as an even better predictor of heart disease, because it captures all the types of cholesterol that can damage your arteries in one figure.
When to Get Tested
The American Heart Association recommends that all adults aged 19 and older get a lipid panel. Children should be screened between ages 9 and 11 if they haven’t been tested before. How often you need repeat testing depends on your results and your overall risk profile, including factors like family history, blood pressure, smoking, and diabetes.
Newer guidance also recommends that every adult get tested at least once in their lifetime for lipoprotein(a), a genetically determined type of cholesterol particle that standard lipid panels don’t measure. Elevated lipoprotein(a) raises cardiovascular risk independent of your other cholesterol numbers, and since it’s largely genetic, diet and exercise don’t move it much. Knowing your level helps your doctor assess your overall risk more accurately.
Family History as a Warning Sign
If a parent, sibling, or child has been diagnosed with very high cholesterol, or if heart attacks or strokes run in your family before age 55 in men or 65 in women, you have a higher likelihood of carrying a genetic predisposition. Familial hypercholesterolemia is clinically diagnosed using a combination of physical findings, family history, personal history of early heart disease, and LDL levels. In adults, an LDL persistently above 190 mg/dL raises strong suspicion. In children, the threshold is an LDL above 160 mg/dL. Genetic testing can confirm the diagnosis, though a negative result doesn’t completely rule it out since some causative mutations haven’t been identified yet.
The distinction between genetic and lifestyle-driven high cholesterol matters because familial hypercholesterolemia is present from birth, meaning damage to the arteries accumulates from childhood. People with this condition typically need medication early and ongoing monitoring, whereas someone whose cholesterol crept up in their 40s due to diet and inactivity may be able to bring numbers down through lifestyle changes alone.
At-Home Cholesterol Tests
Over-the-counter cholesterol test kits are available at most pharmacies and online. The FDA notes these tests can be about as accurate as the ones your doctor uses, provided you follow the instructions carefully. Accuracy does vary by brand. Kits labeled as “traceable” to a CDC standardization program tend to be more reliable.
Most home kits measure only total cholesterol, which gives you a rough idea but not the full breakdown of LDL, HDL, and triglycerides. Some newer kits offer a more complete panel, but for a thorough assessment of your risk, a lab-based lipid panel is still the standard. A home test showing a total cholesterol above 200 mg/dL is a good reason to schedule a full panel with your doctor.