Cholesterol is measured with a simple blood test called a lipid panel, which reports four key numbers: total cholesterol, LDL cholesterol, HDL cholesterol, and triglycerides. Most adults can get this done at a doctor’s office, pharmacy, or even at home with a self-test kit, though accuracy varies significantly between these options.
What a Lipid Panel Actually Measures
A standard lipid panel directly measures three things from your blood sample: total cholesterol, HDL cholesterol (the “good” kind that helps clear cholesterol from your arteries), and triglycerides (a type of fat in your blood, not technically cholesterol). The fourth number on your results, LDL cholesterol (the “bad” kind that builds up in artery walls), is usually calculated using a formula rather than measured directly.
That formula works by subtracting your HDL and a fraction of your triglycerides from your total cholesterol. It’s reliable for most people, but it becomes inaccurate when triglycerides are above 400 mg/dL. If your triglycerides are that high, your doctor will likely order a direct LDL measurement instead.
You may also see a fifth number on your results: non-HDL cholesterol. This is simply your total cholesterol minus your HDL, and it captures all the cholesterol types that can damage your arteries, not just LDL. A combined analysis of 68 studies found non-HDL cholesterol was the single best predictor of heart attacks and strokes among all cholesterol measures. It also doesn’t require fasting to be accurate, which makes it especially useful.
Where and How to Get Tested
Lab Blood Draw
The most accurate option is a standard blood draw from a vein in your arm, processed at a clinical laboratory. This is what you get at a doctor’s office or outpatient lab. The sample is analyzed on high-precision equipment, and results typically come back within a day or two. This is the gold standard that treatment decisions are based on.
Finger-Stick Screening
Pharmacies, health fairs, and some clinics offer quick cholesterol checks using a drop of blood from your fingertip. These are convenient but consistently read higher than a standard blood draw. Research comparing simultaneous finger-stick and venous samples in 108 volunteers found finger-stick results averaged 3.6% higher. That’s enough of a difference to push borderline numbers into the “high” category and trigger unnecessary concern.
Home Test Kits
Over-the-counter cholesterol test kits let you prick your finger at home and either read a result on a meter or mail a sample to a lab. Accuracy varies wildly between brands. A study evaluating five commercially available self-tests found error rates ranging from 6% for the best-performing meter to 20% for the worst. Several kits had “considerably poor accuracy,” meaning they could show you a normal result when your cholesterol is actually high, or vice versa. If you use a home kit, treat the result as a rough estimate rather than a precise reading.
Do You Need to Fast?
Traditional advice says to fast for at least 8 hours before a lipid panel, and many U.S. labs still default to this. But guidelines from the American College of Cardiology and American Heart Association no longer require fasting for routine cardiovascular risk assessment. Non-fasting lipid profiles are now recommended for most situations: initial screening, risk assessment, testing in children, elderly patients, and people with diabetes who risk low blood sugar from skipping meals.
Fasting still matters in specific cases. If your triglycerides come back above 400 mg/dL, your doctor will likely repeat the test fasting to get accurate LDL numbers. Fasting is also preferred before starting cholesterol-lowering medication, when diagnosing a genetic lipid disorder, or when other blood tests being drawn at the same time (like blood sugar) require it. If you’re unsure, ask when you schedule the appointment.
How Often to Get Tested
The CDC recommends cholesterol screening start in childhood. Kids should have their first check between ages 9 and 11, with a follow-up between ages 17 and 21. Healthy adults with no risk factors should be tested every 4 to 6 years. If you have heart disease, diabetes, or a family history of high cholesterol, you’ll need testing more frequently, often annually or as your doctor adjusts treatment.
Reading Your Results
Cholesterol is measured in milligrams per deciliter (mg/dL). The healthy targets for adults age 20 and older are:
- Total cholesterol: less than 200 mg/dL
- LDL cholesterol: less than 100 mg/dL
- HDL cholesterol: 60 mg/dL or higher is ideal. Below 40 mg/dL for men or below 50 mg/dL for women is considered low and increases risk.
- Non-HDL cholesterol: less than 130 mg/dL
- Triglycerides: less than 150 mg/dL. Between 150 and 199 is borderline high, and 200 or above is high.
For children and teens (age 19 and younger), the targets are tighter: total cholesterol below 170 mg/dL, LDL below 110 mg/dL, and HDL above 45 mg/dL.
These are general benchmarks. Your personal targets may differ based on your age, blood pressure, weight, family history, and whether you’re already on medication. A single high reading also isn’t necessarily cause for alarm. Cholesterol levels fluctuate, and doctors typically look at the pattern over time rather than reacting to one test.
Why Non-HDL Cholesterol Deserves Your Attention
Most people focus on their LDL number, but non-HDL cholesterol is increasingly considered the more useful metric. LDL only captures one type of harmful particle, while non-HDL reflects the total cholesterol carried by all artery-damaging particles. This distinction matters most for people with metabolic syndrome, insulin resistance, or high triglycerides, conditions where LDL can look normal even though overall risk is elevated.
Non-HDL doesn’t require any extra blood work or cost. It’s already on your lipid panel or can be calculated in seconds: total cholesterol minus HDL. If your LDL looks fine but your non-HDL is above 130 mg/dL, that’s a signal worth discussing, because it often points to elevated particle counts and small, dense LDL, the type most likely to penetrate artery walls.