Panel guide
How to read a lipid panel blood test
Lipid panels report cholesterol fractions and triglycerides from a blood sample.
General biomarker education — not personalized medical advice. Learn more
What it measures
Common components include total cholesterol, LDL cholesterol, HDL cholesterol, and triglycerides. Some reports include calculated ratios or non-HDL cholesterol.
Why people track it
Lipid history is often reviewed over years. Organizing confirmed values helps you bring a clearer timeline to appointments.
How to read your report
Reference goals may differ by laboratory method and clinical context. Use the range printed on your source report when available.
Important note
This is general information about laboratory markers. It is not a diagnosis, treatment plan, or personalized medical advice. Discuss your results with your clinician.
What’s on the report
A lipid panel reports fats in the blood. The table typically lists total cholesterol, LDL cholesterol, HDL cholesterol, and triglycerides, each with a unit and the lab’s range or goal note. Some reports add non-HDL cholesterol or a cholesterol ratio.
Line-by-line markers
- Total cholesterol
Also called: Cholesterol, Total
A combined cholesterol number. More useful next to LDL, HDL, and triglycerides than alone.
Common units: mg/dL
- LDL cholesterol
Also called: LDL-C, Low-density lipoprotein cholesterol
One cholesterol fraction. May be calculated or measured — the report usually says which.
Common units: mg/dL
- HDL cholesterol
Also called: HDL-C, High-density lipoprotein cholesterol
Another cholesterol fraction, reviewed with the rest of the lipid panel.
Common units: mg/dL
- Triglycerides
Also called: TG, Trigs
A blood fat that can change with recent meals. Fasting status matters for comparison.
Common units: mg/dL
How units work
U.S. reports usually use mg/dL for every lipid line. Some international reports use mmol/L. A value of 100 is not comparable across those unit systems without conversion. Copy the unit from the report.
What a flag means
Many reports mark a result with H, L, high, low, or an asterisk when it sits outside that laboratory’s printed reference interval. A flag is not a diagnosis. It means the value is outside the range on that report — discuss it with your clinician.
Why labs differ
LDL may be calculated or measured. Calculation methods and printed intervals differ by laboratory. Fasting instructions also differ. Use the method note and range on your source report.
How to compare over time
Lipid history is often reviewed across years. Fasting status, recent illness, and method changes can move a number. Save the collection date and whether the draw was fasting so you can compare like with like.
Common questions
- What is on a lipid panel?
- Most lipid panels list total cholesterol, LDL, HDL, and triglycerides. Some add non-HDL cholesterol or a ratio. Exact lines vary by laboratory.
- Do I need to fast for a cholesterol test?
- Many lipid panels are drawn fasting, especially when triglycerides will be used. Some orders are non-fasting. Follow the instructions you were given and keep that note with the result.
- What is the difference between LDL and HDL?
- Both are cholesterol fractions on the same panel. They describe different particles and are interpreted together, not as competing scores. See the LDL vs HDL comparison page for a side-by-side overview.
- Why does my LDL look different at two labs?
- One lab may calculate LDL and another may measure it. Ranges and units can also differ. Compare each result to its own printed range.
- What does a high or low flag mean on a lipid report?
- Many reports mark a result with H, L, high, low, or an asterisk when it sits outside that laboratory’s printed reference interval. A flag is not a diagnosis. It means the value is outside the range on that report — discuss it with your clinician.
- Can I track lipid results from Quest and LabCorp together?
- You can keep reports from different laboratories in one history, but compare carefully. Methods, units, and printed ranges can differ. Use the range on each source report, and ask your clinician before treating a cross-lab change as meaningful.
- Is total cholesterol enough on its own?
- Total cholesterol sums several fractions. Clinicians usually look at LDL, HDL, and triglycerides with it. Bring the full panel, not one circled number.
- How often do people repeat a lipid panel?
- Timing is individualized. Ask your clinician when a repeat makes sense for you rather than following a generic internet schedule.
Upload the report you just learned to read
Confirm extracted values against your source PDF. Charts use the range printed on that report.
See how it works →Questions for your clinician
- How should I interpret my lipid panel relative to prior results?
- Is fasting required for my next lipid test?