HDL stands for high-density lipoprotein. It's also sometimes called "good" cholesterol. Lipoproteins are made of fat and protein. They carry cholesterol, triglycerides, and other fats, called lipids, in the blood from other parts of your body to your liver.
This article discusses the blood test used to measure the level of HDL cholesterol in your blood.
High-density lipoprotein test
How the test is performed
A blood sample is needed.
Blood is typically drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.
Next, the health care provider gently inserts a needle into the vein. The blood collects into an airtight vial or tube attached to the needle. The elastic band is removed from your arm.
Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.
How to prepare for the test
You may be told not to eat or drink anything for 9 - 12 hours before the test.
The health care provider may tell you to stop taking certain drugs before the procedure.
How the test will feel
When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
Why the test is performed
This test is done to check the level of cholesterol in your blood and to see if you are at high risk for a heart attack, stroke, or other cardiovascular problem. Studies of both men and women have shown that the higher your HDL, the lower your risk of coronary artery disease. This is why HDL is sometimes referred to as "good" cholesterol.
The main function of HDL is to help soak up excess cholesterol from the walls of blood vessels and carry it to the liver, where it breaks down and is removed from the body in the bile.
The laboratory test for HDL actually measures how much cholesterol is in each high-density lipoprotein particle, not the actual amount of HDL in the blood.
In general, your risk for heart disease, including a heart attack, increases if your HDL cholesterol level is less than 40 mg/dL.
An HDL 60 mg/dL or above helps protect against heart disease.
Women tend to have higher HDL cholesterol than men.
Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What abnormal results mean
Low HDL levels may be a sign that you have an increased risk for atherosclerotic heart disease.
A low HDL level may also be associated with:
What the risks are
There is very little risk involved with having your blood taken. Veins and arteries vary in size from one patient to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include:
- Excessive bleeding
- Fainting or feeling light-headed
- Hematoma (blood accumulating under the skin)
- Infection (a slight risk any time the skin is broken)
HDL may be done as part of an overall lipid profile, where "bad" cholesterol (LDL) and triglycerides will also be measured. The combined information gathered from all of these tests may help your risk of heart attack, stroke, and peripheral vascular disease.
Your health care provider may recommend therapy if your risk is found to be high. Regular exercise can increase HDL levels by several points.
Expert Panel on Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults. Executive summary of the third report of the National Cholesterol Education Program (NCEP) expert panel on detection, evaluation, and treatment of high blood cholesterol in adults (Adult Treatment Panel III). JAMA. 2001;285:2486-2497. Updated 2004.
U.S. Preventive Services Task Force. Screening for lipid disorders in adults: U.S. Preventive Services Task Force recommendation statement. Rockville (MD): Agency for Healthcare Research and Quality (AHRQ); 2008 Jun.
U.S. Preventive Services Task Force. Screening for Lipid Disorders in Children. US Preventive Services;Task Force recommendation statement. Pediatrics. 2007;120(1):e215-9.
Semenkovich CF. Disorders of lipid metabolism. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 217.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. ©1997-2014 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
On the Horizon: Advances in the Field of Parkinson's
6 Ways to Get Addicted to Exercise
In Bitter Cold, Be Alert for Signs of Hypothermia
An Extensive Guide to the Flu Vaccine: What You Need to Know
Type 1 Diabetes: Some Seniors Cope Better Than Others
Sign Up for Free Newsletters
Ask Your Doctor the RIGHT Questions!
the most from your doctor visit.
Emailed right to you!
The Ask Your Doctor email series
may contain sponsored content.
18+, US residents only please.
Explore Original Articles About...
Get the MOST from QualityHealth
- Top Searches
- 1. Arthritis Management: Nature Heals
- 2. 5 Digestive To-Dos
- 3. Men: Should You Shave It or Leave It?
- 4. Today's Top Fitness Trends
- 5. Sugar and Osteoarthritis : The Link
- 6. Can't Afford Your Hospital Bills?
- 7. Stay Energized All Day Long
- 8. Phobias: Who Has Them and Why?
- 9. What If Your EpiPen Fails?
- 10. 5 Costly Medical Billing Mistakes
- 1. Ice Falls Can Cause Serious Injuries
- 2. Can Inactivity Act Like a Disease?
- 3. Kale Snack Recipe for Diabetics
- 4. How Running Affects Arthritis
- 5. Sugar and Your Immunity System
- 6. Do Weight Loss Supplements Work?
- 7. 5 Super Foods for Spring
- 8. The Hazards of Reusable Bags
- 9. How to Avoid Ingrown Hairs
- 10. Health Tip: Constantly Change Shoes
- 1. 4 Common Treatments for Epilepsy
- 2. What Does a Urogynecologist Do?
- 3. GERD Without Heartburn? It's Possible
- 4. Graston Technique: Can It Work on You?
- 5. Music Therapy Can Help Autism
- 6. 8 Ways to Fight MS-Related Fatigue
- 7. Can You Still Bleed After Menopause?
- 8. Be Your Own Health Care Advocate
- 9. Why Is Syphillis on the Rise?
- 10. Ideal Weight vs. Happy Weight
The material on the QualityHealth Web site is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a physician or other qualified health provider. See additional information.