HDL Cholesterol: Normal Levels, Low and High HDL, and What Your Results Mean

HDL, or high-density lipoprotein, is one of the numbers reported on a standard lipid panel alongside LDL, triglycerides, and total cholesterol — and while it's often called "good" cholesterol, interpreting it well takes more than just checking whether the number is high.

Quick Answer

For most adults, an HDL cholesterol level of 60 mg/dL (1.6 mmol/L) or higher is generally considered protective, while below 40 mg/dL for men or below 50 mg/dL for women (roughly 1.0 or 1.3 mmol/L) is considered a risk factor. Unlike LDL, higher HDL is usually favorable — but that doesn't mean more is always better: very high HDL isn't automatically more protective, and HDL should always be interpreted alongside the rest of your lipid panel and overall cardiovascular risk, not by itself.

What Is HDL Cholesterol?

HDL (high-density lipoprotein) is a particle that carries cholesterol through the bloodstream. It's commonly called "good" cholesterol because one of its roles is helping move excess cholesterol from the bloodstream and artery walls back to the liver, where it's processed and removed — a process that may help limit plaque buildup in arteries.

That said, "good" and "bad" is a simplification. LDL and HDL aren't opposites that simply cancel each other out — they're different particles with different roles, and both are measured because each gives separate information about cardiovascular risk. See our LDL cholesterol guide for the other side of that picture.

What Is a Normal HDL Cholesterol Level?

A commonly used general reference range for adults:

• 60 mg/dL (1.6 mmol/L) or higher is generally considered protective
• Below 40 mg/dL for men, or below 50 mg/dL for women — roughly 1.0 or 1.3 mmol/L — is considered a risk factor
• Levels in between are better than the risk-factor range, but not yet in the protective range

These are general population reference ranges, not personalized treatment targets, and they use a different threshold for men and women specifically for the "low" cutoff. There's no separate, authoritative age-specific HDL chart for adults — age is one of several factors a doctor considers alongside your HDL number, not a separate numeric target.

HDL Cholesterol Levels Chart

This is a general reference chart, not a universal treatment target — see "High HDL Cholesterol" below for why a higher number isn't automatically better past a certain point.

Low HDL Cholesterol

Low HDL — below 40 mg/dL for men or below 50 mg/dL for women — is considered a cardiovascular risk factor on its own, separate from LDL. It's commonly associated with:

• Physical inactivity
• Smoking
• Excess weight, particularly around the abdomen
• Type 2 diabetes and insulin resistance
• High triglycerides, which often move in the opposite direction from HDL
• Certain genetic factors

Low HDL is rarely interpreted alone. Clinicians look at it together with LDL, triglycerides, non-HDL cholesterol, blood pressure, diabetes status, smoking history, age, and overall cardiovascular risk — not as an isolated number requiring its own separate treatment target. See our normal cholesterol levels guide for how these numbers fit together.

High HDL Cholesterol

It's a common assumption that higher HDL is always better. That's not quite accurate.

While an HDL in the general protective range (60 mg/dL / 1.6 mmol/L or higher) is a favorable sign, research has increasingly found that higher HDL doesn't reliably predict lower cardiovascular risk across all groups. A 2022 NHLBI-funded study of more than 23,000 U.S. adults found that higher HDL levels were not associated with reduced cardiovascular disease events for either Black or white adults, challenging the long-held assumption that more "good" cholesterol is always protective.

This doesn't mean very high HDL is dangerous — the evidence doesn't support that claim either. It means HDL, including a very high number, should be interpreted in the context of your full lipid profile and overall cardiovascular risk rather than assumed to be automatically protective on its own.

HDL vs LDL

See our LDL cholesterol guide for the normal range and why personal LDL targets vary.

HDL vs Total Cholesterol vs Triglycerides

A full lipid panel reports HDL alongside total cholesterol, LDL, and triglycerides — and none of these numbers is meant to be read alone:

• Total cholesterol combines LDL, HDL, and a portion of triglycerides into one number, so it can look similar in very different underlying situations.
• Triglycerides are a different type of blood fat, not cholesterol itself, and tend to move in the opposite direction from HDL.
• LDL is the number most directly linked to plaque buildup.

Our normal cholesterol levels guide covers how all of these fit together, and our triglycerides guide covers what raises triglycerides specifically.

HDL Cholesterol Test

HDL is measured as part of a standard lipid panel blood test, alongside total cholesterol, LDL, and triglycerides, and is reported in mg/dL (or mmol/L in some countries). Most routine lipid panels today don't require fasting beforehand — non-fasting testing is now considered valid for general cholesterol screening in adults. Fasting is still sometimes requested in specific situations, such as when triglycerides need the most accurate reading, since triglycerides (not HDL) are the number most affected by recent food intake.

Your HDL number is most useful read alongside the rest of your results — not checked in isolation — since cardiovascular risk depends on the full lipid panel together with your broader health history.

What Can Affect HDL Levels?

Several factors influence HDL, including:

• Physical activity — regular aerobic exercise tends to raise HDL
• Smoking — lowers HDL; quitting can help raise it
• Body weight — losing excess weight, especially around the abdomen, is associated with higher HDL
• Diet — overall dietary pattern influences the full lipid profile, including HDL
• Metabolic health — conditions like type 2 diabetes and insulin resistance are commonly associated with lower HDL
• Genetics — some people naturally run higher or lower regardless of lifestyle
• Medications — certain medications can affect HDL as a side effect
• Triglyceride levels — HDL and triglycerides often move in opposite directions

How to Improve Your Cholesterol Profile

Cardiovascular risk reduction isn't simply about raising HDL — it generally focuses on your complete lipid profile and overall risk, particularly LDL and other established risk factors. Evidence-supported measures include:

• Regular physical activity
• Avoiding smoking, or quitting if you currently smoke
• A generally healthy dietary pattern
• Weight management, when appropriate
• Managing diabetes or other metabolic risk factors
• Following any treatment your clinician has prescribed, including medication if indicated

There's no authoritative evidence supporting supplements as a routine way to raise HDL or reduce cardiovascular risk, so this guide doesn't recommend any. See our how to lower cholesterol guide for the lifestyle changes with the strongest evidence behind them for the lipid profile overall.

When Should You Talk to a Doctor?

It's worth discussing your lipid panel with a doctor whenever your HDL — or any other result on the panel — falls outside the general reference ranges, when a doctor recommends it based on your personal risk factors, or whenever you have questions about what your specific numbers mean for you. A single lipid panel is most useful interpreted alongside your overall health picture, not read in isolation.

Sources

• Cholesterol Levels: What You Need to Know — MedlinePlus
• Blood Cholesterol — National Heart, Lung, and Blood Institute (NHLBI)
• Study Challenges "Good" Cholesterol's Role in Universally Predicting Heart Disease Risk — NHLBI
• HDL (Good), LDL (Bad) Cholesterol and Triglycerides — American Heart Association
• Testing for Cholesterol — CDC