What does a lipid panel include?
A standard lipid panel blood test typically reports four values: total cholesterol, LDL (low-density lipoprotein), HDL (high-density lipoprotein), and triglycerides. Some panels also include non-HDL cholesterol and the total cholesterol-to-HDL ratio, which clinicians sometimes use for risk assessment.
Most lipid panels require fasting for 9–12 hours beforehand because triglycerides rise significantly after eating. Non-fasting lipid panels are increasingly used for screening but may show higher triglyceride values.
Reference ranges at a glance
The table below shows commonly referenced thresholds from major cardiovascular guidelines. Your lab report will print its own reference interval — use that as your primary comparison.
| Marker | Desirable | Borderline | High / Low risk | Key note |
|---|---|---|---|---|
| Total Cholesterol | < 200 mg/dL | 200–239 mg/dL | ≥ 240 mg/dL | Screening value; always interpret with the full lipid panel. |
| LDL Cholesterol | < 100 mg/dL (optimal) | 130–159 mg/dL | ≥ 160 mg/dL | Target varies based on cardiovascular risk — lower for high-risk individuals. |
| HDL Cholesterol | ≥ 60 mg/dL (protective) | 40–59 mg/dL | < 40 mg/dL (low, a risk factor) | Higher is generally better; low HDL is a cardiovascular risk factor. |
| Triglycerides | < 150 mg/dL | 150–199 mg/dL | ≥ 200 mg/dL | Affected by recent meals, alcohol, and medications. |
LDL cholesterol: what does it actually measure?
LDL carries cholesterol from the liver to tissues throughout the body. Elevated LDL is associated with a higher risk of plaque building up in artery walls (atherosclerosis). For this reason, most cardiovascular guidelines focus on lowering LDL as a primary target.
However, the target LDL is not the same for everyone. A person with established heart disease or diabetes may have a target below 70 mg/dL, while a healthy person with no risk factors may have a target below 130 mg/dL. The number alone cannot tell you whether treatment is needed.
How is LDL calculated?
Most labs calculate LDL using the Friedewald equation rather than measuring it directly. This calculation is less accurate when triglycerides are very high (above 400 mg/dL). Some labs now offer direct LDL measurement in those cases.
HDL cholesterol: higher is generally better
HDL transports cholesterol from tissues back to the liver for removal. Higher HDL levels are generally associated with lower cardiovascular risk — which is why it is sometimes called "good cholesterol," though that label oversimplifies the biology.
Low HDL (below 40 mg/dL in men, below 50 mg/dL in women) is considered an independent cardiovascular risk factor. Lifestyle factors including exercise, smoking cessation, and weight management can raise HDL in some people. There are currently no approved medications that specifically target low HDL with proven cardiovascular benefit.
Triglycerides: the often-ignored number
Triglycerides are the main form of fat stored in the body. Elevated triglycerides can result from diet (especially high sugar and refined carbohydrate intake), alcohol, obesity, poorly controlled diabetes, and some medications.
Very high triglycerides (above 500–1000 mg/dL) carry a risk of pancreatitis. Moderately elevated triglycerides contribute to cardiovascular risk, particularly when combined with low HDL or elevated LDL.
Fasting matters for triglycerides
If you ate before the test, your triglyceride result may be falsely elevated. Check your lab report for any fasting notation. If you were not fasting, ask your doctor whether a repeat fasting test is worthwhile.
Total cholesterol: a screening number, not a diagnosis
Total cholesterol is the sum of LDL, HDL, and a fraction of triglycerides. It is useful as an initial screening value but should never be interpreted alone. Someone can have a "normal" total cholesterol of 195 mg/dL but still have a poor HDL-to-LDL ratio or elevated triglycerides that warrant attention.
The cholesterol ratio
Some clinicians calculate the total cholesterol-to-HDL ratio or the LDL-to-HDL ratio as a broader risk marker. A total cholesterol-to-HDL ratio below 4 is often cited as favorable. These ratios are screening tools, not diagnostic criteria.
What affects cholesterol results?
- Diet: High saturated fat and trans fat intake raises LDL.
- Exercise: Regular aerobic activity raises HDL.
- Weight: Excess weight tends to raise LDL and triglycerides and lower HDL.
- Smoking: Lowers HDL and damages artery walls.
- Genetics: Familial hypercholesterolaemia causes very high LDL regardless of diet.
- Medications: Statins, fibrates, and other drugs alter cholesterol levels.
- Thyroid function: Hypothyroidism can significantly raise cholesterol.
Should you be worried if your LDL is flagged?
A flagged LDL does not mean you need medication or that a heart attack is imminent. Your doctor considers the full cardiovascular risk picture: age, sex, smoking status, blood pressure, diabetes, family history, and sometimes a calculated 10-year risk score (such as the Pooled Cohort Equations in the US or QRISK in the UK). Discuss what the flagged value means in your specific context.
See your cholesterol values in context
Upload your blood test report to our AI analyzer. It will read each value from your lab's own reference range and explain what each marker generally measures.
Analyze my blood test →