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HDL

General

High-Density Lipoprotein

The protective cholesterol type that helps remove excess cholesterol from the bloodstream, often called 'good' cholesterol, and measured directly on a standard lipid panel.

Definition

HDL (High-Density Lipoprotein) is the cholesterol-carrying particle that helps remove excess cholesterol from the bloodstream by transporting it back to the liver for processing and removal. This is the opposite direction of LDL, which delivers cholesterol to tissues — a key reason higher HDL levels are generally considered protective against cardiovascular disease.

Unlike LDL and VLDL, HDL is measured directly on a standard lipid panel rather than being calculated from other values.

Formula

HDL is measured directly on a lipid panel rather than calculated — there is no formula for HDL itself. It is, however, a required input for the Cholesterol Ratio Calculator and the LDL Calculator's Friedewald formula:

Cholesterol Ratio = Total Cholesterol ÷ HDL LDL = Total Cholesterol − HDL − (Triglycerides ÷ 5)

Worked Example

With HDL of 55 mg/dL and total cholesterol of 190 mg/dL:

Cholesterol Ratio = 190 ÷ 55 = 3.45, within the optimal range of under 3.5:1.

Key Things to Know

  • Higher is generally better: unlike LDL, elevated HDL is associated with lower cardiovascular risk, not higher.
  • Exercise is the most reliable way to raise it: regular aerobic activity tends to have a more pronounced effect on HDL than dietary changes alone.
  • Factors into the cholesterol ratio: HDL is the denominator in the standard cholesterol ratio calculation.
  • Measured directly, not calculated: HDL doesn't rely on an estimation formula the way LDL and VLDL do.

Related Calculators

Cholesterol Ratio Calculator →Calculate your total cholesterol-to-HDL ratio, LDL/HDL ratio, and non-HDL cholesterol from a standard lipid panel, with AHA-based cardiovascular risk context.
LDL Calculator →Calculate LDL cholesterol from total cholesterol, HDL, and triglycerides using the Friedewald formula, with a risk category and the high-triglyceride caveat noted.

Related Terms

LDLLow-Density LipoproteinVLDLVery Low-Density LipoproteinCholesterol RatioTotal Cholesterol to HDL Ratio

Frequently Asked Questions

HDL helps transport excess cholesterol from the bloodstream back to the liver for removal, rather than delivering it to tissues the way LDL does, which is why higher HDL levels are generally considered protective against cardiovascular disease.
General guidelines often cite above 60 mg/dL as protective and above 40 mg/dL (men) or 50 mg/dL (women) as an acceptable minimum, though specific targets can vary by individual risk profile — discuss your specific numbers with a doctor.
Regular aerobic exercise is one of the most consistently effective ways to raise HDL, along with quitting smoking and, where medically appropriate, moderate alcohol consumption. These tend to have a more pronounced effect on HDL than on lowering LDL.
HDL is measured directly on a standard lipid panel, unlike [LDL](/glossary/ldl/) and [VLDL](/glossary/vldl/), which are typically estimated from other values using a formula.
Yes — cardiovascular risk is influenced by the balance between LDL and HDL, not any single value in isolation, so a low HDL can still elevate overall risk even alongside a controlled LDL.