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Reading a Lipid Panel: LDL, HDL, Triglycerides

Your cholesterol report has four key numbers. Learn what each one means, why LDL is the one that builds plaque, and how to read the panel without panic.

Cholesterol needs a carrier

Cholesterol is not a villain — it is a waxy fat your body needs to build cell walls and hormones. The problem is transport. Fat does not dissolve in blood, so cholesterol travels packaged inside protein-coated particles called lipoproteins. The lipid panel is a blood test that measures these carriers, and it usually reports four numbers.

The four numbers

  1. LDL cholesterol — the “bad” carrier. LDL drops cholesterol off into artery walls, where it becomes plaque. This is the number prevention works hardest to lower; lower is better.
  2. HDL cholesterol — the “good” carrier. HDL picks cholesterol back up and returns it to the liver. Higher is generally favorable, though raising it with drugs has not proven helpful.
  3. Triglycerides — a separate type of blood fat. High triglycerides often travel with diabetes, excess weight, and alcohol, and add to risk.
  4. Total cholesterol — total cholesterol roughly sums it all up. Useful for a quick glance but too blunt to guide treatment on its own.
Example lipid panel (mg/dL)
  Total cholesterol .... 232
  HDL ("good") ......... 42
  Triglycerides ........ 180
  LDL ("bad") .......... calculated

Friedewald estimate:
  LDL = Total - HDL - (Triglycerides / 5)
  LDL = 232  - 42  - (180 / 5)
  LDL = 232  - 42  - 36
  LDL = 154 mg/dL

Reading it:
  LDL 154  -> elevated; main target to lower
  HDL 42   -> on the low side (higher is better)
  Trig 180 -> borderline-high
  Note: the /5 estimate is unreliable when
  triglycerides are very high (>400).
Estimating LDL from the other numbers, and what each value signals.

Beyond the standard four

A persistently abnormal pattern is called dyslipidemia. In some people, a doctor adds lipoprotein(a) — a partly inherited particle that raises risk independently of the usual numbers and is worth checking once, especially with a strong atherosclerosis family history. You usually do not need to fast for a modern lipid panel, but follow whatever instruction your clinic gives.