HDL Cholesterol – Understanding Your Blood Test Result

Section Editor: Christopher McCudden Ph.D., DABCC, FADLM, FCACB
October 28, 2026

HDL cholesterol, short for high-density lipoprotein cholesterol, is the cholesterol carried in the blood by particles that help remove extra cholesterol from the body. It is often called “good” cholesterol. In the United States, HDL cholesterol is reported as part of a lipid panel in milligrams per deciliter (mg/dL); in most other countries, it is reported in millimoles per liter (mmol/L).

This article explains what the HDL cholesterol test measures, and why HDL is used to estimate your risk of heart disease. It also explains why doctors do not try to raise HDL with medication. Later sections cover what low and high HDL results mean and why very high HDL isn’t always better.

The reference range that applies to your result is the one printed on your laboratory report, not the typical ranges shown here. Reference ranges vary between laboratories based on the equipment used, the population tested, and individual factors such as age, sex, and pregnancy status. Always compare your result to the reference range printed on your own report, and discuss any abnormal result with your doctor.

What does the HDL cholesterol test measure?

The HDL cholesterol test measures how much cholesterol your blood carries in high-density lipoprotein particles. Cholesterol doesn’t dissolve in blood, so it travels in particles called lipoproteins. HDL particles pick up extra cholesterol from tissues, including the walls of arteries, and carry it back to the liver to be removed.

Unlike LDL cholesterol, which is usually calculated, the laboratory measures HDL cholesterol directly. The lab then uses the HDL result in two calculations on the same report. The lab subtracts it from total cholesterol to get non-HDL cholesterol, and it is one of the numbers used to calculate LDL cholesterol.

Why HDL cholesterol counts toward your risk but is not a treatment target

HDL cholesterol plays a different role in your care than LDL cholesterol. Across large groups of people, a low HDL is linked to a higher risk of heart attack and stroke. For that reason, doctors include HDL in the calculators they use to estimate your risk, and a low HDL raises that estimate.

Raising HDL with medication, however, has not been shown to prevent heart attacks or strokes. Large trials tested several medicines that raise HDL and did not deliver the benefit people expected. Studies of inherited differences in HDL have also found that people born with higher HDL are not protected as much as their numbers would suggest.

Current guidelines therefore set treatment goals for LDL cholesterol and non-HDL cholesterol, not for HDL. This applies to the 2026 American College of Cardiology and American Heart Association guideline and to the 2021 Canadian Cardiovascular Society guidelines. A low HDL changes your risk estimate, and your doctor responds by looking at the LDL target and your other risk factors.

How is the HDL cholesterol test performed?

HDL cholesterol is measured on the same blood draw as the rest of your lipid panel. The laboratory separates HDL from the other lipoprotein particles in the sample and measures the cholesterol inside it. You usually don’t need to fast, since a normal meal barely affects the HDL result, but follow any instructions your laboratory gave you.

HDL can drop for several weeks during or after a serious illness, an infection, or an operation. If your HDL was checked during one of those periods, the number may be lower than your usual level, and your doctor may recheck it after you have recovered.

What do HDL cholesterol results mean?

Read your HDL cholesterol result against the reference range printed on your report, and always consider it with your LDL cholesterol and other risk factors. Women tend to have higher HDL than men, so the cutoffs differ by sex.

A low HDL. Below approximately 40 mg/dL (1.0 mmol/L) in men, or below 50 mg/dL (1.3 mmol/L) in women. A low HDL adds to your estimated risk of heart disease, and it often appears alongside high triglycerides and extra weight around the waist.
A typical HDL. Most adults fall between these lower cutoffs and about 60 mg/dL (1.6 mmol/L) or somewhat above. An HDL in this range does not meaningfully increase or lower your risk estimate.
A high HDL. Above about 60 mg/dL (1.6 mmol/L). This is usually a favorable finding, but it does not offset high LDL cholesterol.
A very high HDL. Well above the usual range. A large Danish study of about 116,000 adults, published in 2017, found higher death rates in men with HDL of 3.0 mmol/L (116 mg/dL) or more. The same was seen in women with HDL of 3.5 mmol/L (135 mg/dL) or more. Results like these are uncommon and not a reason for alarm, but they mean you shouldn’t read very high HDL as extra protection.

What conditions and factors can affect HDL cholesterol?

Inherited factors and several habits and medical conditions influence HDL cholesterol. Most factors that lower HDL also increase the risk of heart disease on their own.

Conditions and factors that can lower HDL cholesterol include:

Smoking. Smoking lowers HDL, and HDL usually rises within months of stopping.
Physical inactivity and extra body weight. Weight carried around the waist has the strongest effect, and losing weight usually raises HDL.
Type 2 diabetes and high triglycerides. These usually travel together with a low HDL, a pattern sometimes called metabolic syndrome.
Some medications. Anabolic steroids and some progestin-containing medications can lower HDL.
Acute illness. Infection, surgery, and other serious illness lower HDL for a few weeks.
Rare inherited conditions. Gene changes that affect HDL particle production can cause very low HDL from birth, and these usually run in families.

Conditions and factors that can raise HDL cholesterol include:

Regular physical activity. Aerobic exercise raises HDL modestly in most people.
Estrogen. HDL is naturally higher in women before menopause, and estrogen-containing medications can raise it.
Alcohol. Regular drinking raises HDL, but this is not a reason to drink, because alcohol raises other health risks.
Inherited variants. Some people have naturally high HDL because of genetic variations that affect how the body clears HDL from the blood.

What other tests are ordered with HDL cholesterol?Interpret

HDL cholesterol alongside the rest of the lipid panel and a few related tests.

LDL cholesterol. This is the main treatment target and carries much more weight in treatment decisions than HDL.
Total cholesterol and non-HDL cholesterol. Non-HDL cholesterol is total cholesterol minus HDL, and it captures all the particles that can build up in arteries.
Triglycerides. Low HDL with high triglycerides is a common pattern that points to insulin resistance or excess weight.
Blood sugar tests. A low HDL may prompt a diabetes check, such as a hemoglobin A1c.
The cholesterol ratio. Some reports include the total cholesterol-to-HDL ratio. Some risk calculators use it, and a lower ratio is generally more favorable.

What happens after an HDL cholesterol test?

After an HDL cholesterol test, your doctor uses the result as part of your overall cardiovascular risk estimate. A low HDL usually prompts a closer look at your LDL cholesterol, blood sugar, and blood pressure, rather than treatment aimed at HDL itself.

If your HDL is low, your doctor may discuss stopping smoking, staying active, and losing weight if that applies to you. These changes tend to raise HDL and lower your overall risk. If your risk is high enough, your doctor may suggest medication to lower LDL cholesterol, even though your HDL is the number that was flagged.

A high or very high HDL usually needs no specific follow-up. Your doctor will still consider your LDL cholesterol and other risk factors, since high HDL does not cancel those out.

Questions to ask your doctor

What was my HDL cholesterol, and what is the reference range at this laboratory?
How does my HDL affect my estimated risk of heart disease?
Is my LDL cholesterol at the target you have set for me?
Could smoking, my weight, or my activity level be lowering my HDL?
Could any of my medications be affecting my HDL?
Should I be tested for diabetes?
Is my very high HDL a concern?
Could a recent illness have affected this result?
When should I have my cholesterol checked again?
How does this result compare with my previous HDL results?