A standard lipid panel measures four things: total cholesterol, LDL cholesterol, HDL cholesterol, and triglycerides. Most labs also report a few calculated values derived from those four numbers, like VLDL cholesterol and non-HDL cholesterol, at no extra cost. Here’s what each one means and what your results should look like.
The Four Core Measurements
Every lipid panel starts with the same basic blood work. Three of the four measurements focus on cholesterol, while the fourth measures a different type of fat entirely.
- Total cholesterol is the sum of all cholesterol circulating in your blood. Ideal is below 200 mg/dL.
- LDL cholesterol is often called “bad” cholesterol because it deposits fat inside artery walls. Ideal is below 100 mg/dL, or below 70 mg/dL if you have diabetes.
- HDL cholesterol is the “good” cholesterol that helps remove fat from your arteries. For men, it should stay above 40 mg/dL; for women, above 50 mg/dL. The protective sweet spot is generally between 60 and 80 mg/dL.
- Triglycerides are not cholesterol at all. They’re a separate fat your body uses for energy storage. Ideal is below 150 mg/dL.
Of these four, only total cholesterol, HDL, and triglycerides are directly measured from your blood sample. LDL is almost always calculated using a formula that subtracts HDL and a triglyceride-based estimate from your total cholesterol. This formula, known as the Friedewald equation, has been the global standard since 1972. It works well for most people, but it becomes less accurate when triglycerides are above 150 mg/dL. Newer equations exist that handle high triglyceride levels better, and some labs have started adopting them.
Calculated Values on Your Report
Beyond the big four, your lab report will often include a few extra numbers that are derived from your results rather than measured separately.
VLDL cholesterol (very low-density lipoprotein) is estimated by dividing your triglycerides by five. So if your triglycerides are 150 mg/dL, your VLDL will show up as 30 mg/dL. VLDL particles are produced by the liver and carry most of the triglycerides in your blood. Ideal VLDL is below 30 mg/dL.
Non-HDL cholesterol is simply your total cholesterol minus your HDL. This number captures all the cholesterol carried in particles that can contribute to artery disease, not just LDL. A combined analysis of 68 studies found that non-HDL cholesterol was the best predictor of heart attacks and strokes among all cholesterol measures. It’s especially useful when triglycerides are elevated, because it can flag risk that a normal-looking LDL number might miss. Some people with acceptable LDL levels still have high non-HDL cholesterol, which points to elevated numbers of small, dense LDL particles and other harmful lipoproteins.
Some reports also include the total cholesterol to HDL ratio. You can calculate it yourself by dividing your total cholesterol by your HDL. A ratio below 4.2 is roughly average, and a ratio of 3 or lower is considered a strong indicator of low cardiovascular risk. This ratio correlates well with the actual number of LDL particles in your blood, which is one reason some clinicians find it more informative than LDL alone.
What a Standard Panel Does Not Include
A basic lipid panel won’t tell you everything about your cardiovascular risk. Two markers in particular are sometimes ordered as add-ons but are not part of routine screening.
Lipoprotein(a), often written as Lp(a), is a genetically determined particle that raises heart disease risk independently of your other cholesterol numbers. Guidelines from HEART UK recommend measuring it if you have a personal or family history of early heart disease (before age 60), a first-degree relative with high Lp(a), familial high cholesterol, calcific aortic valve disease, or borderline cardiovascular risk that’s hard to categorize. Most people only need it checked once in their lifetime since it’s largely set by genetics and doesn’t change much.
Apolipoprotein B is a protein found on every LDL, VLDL, and Lp(a) particle. Measuring it gives a direct count of how many harmful particles are in your blood, which can be more revealing than measuring how much cholesterol those particles carry. Like Lp(a), it requires a separate order.
Do You Need to Fast?
For most people, fasting is no longer required. European and international guidelines now recommend testing under normal eating conditions, since a typical meal only raises triglycerides by about 27 mg/dL, which doesn’t meaningfully change the interpretation of your results. If your non-fasting triglycerides come back above 400 mg/dL, your provider will likely ask you to repeat the test after an overnight fast to get a more accurate LDL calculation.
How Often to Get Tested
Current guidelines from the American Heart Association and American College of Cardiology recommend starting lipid screening at age 20. For adults aged 40 to 75, a lipid panel is part of a broader cardiovascular risk assessment that factors in age, sex, diabetes status, and other variables. If your initial results are normal and you have no major risk factors, retesting every 4 to 6 years is typical. People on cholesterol-lowering medication or those with elevated risk are usually tested more frequently to track their response to treatment.
For adults over 75, the decision to continue routine screening is more individualized, taking into account overall health, other medical conditions, and life expectancy.
Reading Your Results Together
No single number on a lipid panel tells the full story. A low LDL looks reassuring, but if your triglycerides are high and your HDL is low, your non-HDL cholesterol may still signal significant risk. This is why clinicians look at the whole panel as a set of interconnected values rather than evaluating any one number in isolation.
Remnant cholesterol is one example of a newer concept built from standard panel results. It’s calculated as total cholesterol minus HDL minus LDL, and it represents the cholesterol carried in triglyceride-rich particles. Elevated remnant cholesterol is increasingly recognized as an independent contributor to artery disease, and it’s something you can derive from the numbers already on your report without any additional testing.
If your results fall outside ideal ranges, the pattern of which numbers are off helps guide what comes next. High LDL with normal triglycerides points in a different direction than normal LDL with sky-high triglycerides, even though both represent elevated cardiovascular risk. Your provider uses that pattern, along with your personal and family history, to decide whether lifestyle changes alone are sufficient or whether medication makes sense.