HDL Cholesterol Test

What is the HDL cholesterol test?

This blood test measures a kind of fat (lipid) called high-density lipoprotein (HDL) cholesterol.

Why is this test done?

The HDL test helps check your risk for heart disease or atherosclerosis, which is a hardening, narrowing, or blockage of the arteries.

HDL is also called good cholesterol. Having high levels of HDL in your blood lowers your risk of heart disease. (You can think of "H" for "healthy" cholesterol.) HDL attaches to and carries away harmful blood fats. HDL helps keep other types of cholesterol from sticking to the walls of your blood vessels and causing blockages.

Tests measuring other types of cholesterol and fats, such as triglycerides, are often done at the same time as the HDL test. Together, these lipid tests are often called a lipid panel.

The higher your HDL is, the lower your risk of heart disease.

If you have changed your diet and exercise habits or are taking medicine to improve your cholesterol levels, this test can help show how well your treatment is working.

How do I prepare for this test?

• It is generally recommended that you fast overnight before this test. This means not eating or drinking anything after midnight the night before your test. If you need to take medicines, you may take them with a small amount of water on the morning of your test.
• Lipid levels are affected by fat in your diet. Avoid eating fatty foods the evening before your test.
• Don't drink any alcohol for 24 hours before the test.
• Avoid exercise for 12 to 14 hours before the test.
• You may need to avoid taking certain medicines before the test because they might affect the test result. Make sure your healthcare provider knows about any medicines, herbs, or supplements that you are taking. Don't stop any of your regular medicines without first consulting with your healthcare provider.
• Talk to your healthcare provider before the day of your test if you have any questions about how to prepare.

How is the test done?

A small amount of blood is taken from your arm with a needle. The blood is collected in tubes and sent to a lab.

Having this test will take just a few minutes of your time.

How will I get the test result?

Ask your healthcare provider when and how you will get the result of your test.

What does the test result mean?

Because HDL cholesterol protects against heart disease, higher numbers are better. HDL levels of 60 mg/dL or higher help to lower your risk for heart disease. A level under 40 mg/dL is low and increases your risk for heart disease.

Your HDL level may be low because:

• You have inherited a tendency to have a low HDL.
• You smoke.
• You don't get enough exercise.

What if my test result is low?

Test results are only one part of a larger picture that takes into account your personal and family medical history and your current health. Sometimes a test needs to be repeated to check the first result. Talk to your healthcare provider about your result and ask questions.

If your test result is not normal, ask your healthcare provider:

• if you need additional tests
• what you can do to work toward a normal value or what kind of treatment you may need
• when you need to be tested again