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Lipid Tests

(Cholesterol Tests)

 

Definition

Cholesterol is a waxy substance that is similar to fat. There are different types of cholesterol including:

  • High-density lipoprotein (HDL) cholesterol
  • Low-density lipoprotein (LDL) cholesterol
  • Triglycerides

Cholesterol tests measure the levels of cholesterol in the blood. They can measure the amount of HDL cholesterol, LDL cholesterol, and your total cholesterol levels. A test called the lipid profile test may be used. This test measures the cholesterol levels plus triglycerides. Triglycerides are a type of fat or lipid in the blood.

 

Reasons for Test    TOP

This test is done to measure the levels of cholesterol in the blood. Abnormal levels of cholesterol are linked to an increased risk of plaque formation in blood vessels. This plaque formation can lead to a heart attack or stroke. The results will be used to estimate your risk of heart disease.

Plaque Formation in a Blood Vessel

Plaque

Copyright © Nucleus Medical Media, Inc.

 

Possible Complications    TOP

There are no major complications associated with this test.

 

What to Expect    TOP

Prior to Test

Steps to take before the test depend on the test you are having. For example:

  • Fasting lipid profile—You will need to stop eating or drinking 9-12 hours before the test. Water is allowed during this time.
  • Total cholesterol test and total cholesterol test with HDL measurement—You do not need to fast.

Description of Test

You will be asked to sit. An area inside your elbow will be cleaned with an antiseptic wipe. A large band will be tied around your arm. The needle will then be inserted into a vein. A tube will collect the blood from the needle. The band on your arm will be removed. Once all the blood is collected, the needle will be removed. Some gauze will be placed over the site to help stop bleeding. You may also be given a bandage to place over the site. The process takes about 5-10 minutes.

After Test    TOP

After the blood sample is collected, you may need to stay seated for 10-15 minutes. If you are lightheaded, you may need to stay seated longer. When you feel better, you can leave.

In some cases, a bit of blood may ooze from the vein beneath the skin and cause a bruise. The risk of bruising can be minimized by placing firm pressure over the puncture site. A bruise will usually resolve in a day or two.

How Long Will It Take?    TOP

A few minutes

Will It Hurt?    TOP

It may hurt slightly when the needle is inserted.

Results    TOP

Talk to your doctor about your test results. More testing may need to be done depending on your test results.

 

Call Your Doctor    TOP

Call your doctor if any of these occur:

  • Increased redness, pain, or discharge from the blood test site.
  • Severe bruising or swelling.

If you think you have an emergency, call for emergency medical services right away.

RESOURCES:

American Heart Association
http://www.heart.org

National Heart, Lung, and Blood Institute
https://www.nhlbi.nih.gov

CANADIAN RESOURCES:

Dietitians of Canada
https://www.dietitians.ca

Heart and Stroke Foundation of Canada
http://www.heartandstroke.ca

REFERENCES:

Akosah KO, Schaper A, Cogbill C, Schoenfeld P. Preventing myocardial infarction in the young adult in the first place: how do the National Cholesterol Education Panel III guidelines perform? J Am Coll Cardiol. 2003;41(9):1475-1479.

Cholesterol. Lab Tests Online—American Association for Clinical Chemistry website. Available at: https://labtestsonline.org/tests/cholesterol. Updated March 26, 2018. Accessed March 26, 2018.

High blood cholesterol. National Heart, Lung, and Blood Institute website. Available at: https://www.nhlbi.nih.gov/health-topics/high-blood-cholesterol. Accessed March 26, 2018.

How to get your cholesterol tested. American Heart Association website. Available at:
...(Click grey area to select URL)
Updated January 29, 2018. Accessed March 26, 2018.

Law MR, Wald NJ. Risk factor thresholds: their existence under scrutiny. BMJ. 2002;324(7353):1570-1576.



Last reviewed March 2018 by EBSCO Medical Review Board Marcin Chwistek, MD
Last Updated: 5/1/2014

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