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During the test
Liver function tests are done using a blood sample. Usually, the blood is drawn through a small needle inserted into a vein in the bend of your arm. You'll be asked to roll up your sleeve if you're wearing long sleeves. The person drawing the blood might tie a band around your upper arm and ask you to make a fist. This causes your vein to stand out more, making it easier to insert the needle into the vein. The needle is attached to a small tube, to collect your blood. All of this usually takes just a few minutes.
You may feel a quick pain as the needle is inserted into your arm and experience some short-term discomfort at the site after the needle is removed.
After the test
Once the needle is removed, a piece of gauze and a bandage or other similar material is used to cover the area where the needle was inserted. You'll be asked to gently apply pressure to the area for a minute or so, to help stop any bleeding.
Your blood will be sent to a laboratory for analysis. If the laboratory analysis is done on-site, you could have your test results within hours. If your doctor sends your blood to an off-site laboratory, you may receive the results within several days.
- Kaplan MM, et al. Approach to the patient with abnormal liver function tests. http://www.uptodate.com/home/index.html. Accessed July 2, 2010.
- Pratt DS. Liver chemistry and function tests. In: Feldman M, et al. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 9th ed. Philadelphia, Pa.: Saunders Elsevier; 2010. http://www.mdconsult.com/php/208033710-3/homepage. Accessed July 2, 2010.
- Common blood tests. National Heart, Lung, and Blood Institute. http://www.nhlbi.nih.gov/health/dci/Diseases/bdt/bdt_what.html. Accessed July 2, 2010.
- Laboratory reference values. Rochester, Minn.: Mayo Foundation for Medical Education and Research; July 1, 2010.
- PT and INR. Lab Tests Online. http://www.labtestsonline.org/understanding/analytes/pt/glance.html. Accessed July 6, 2010.
- Albumin. Lab Tests Online. http://www.labtestsonline.org/understanding/analytes/albumin/test.html#is. Accessed July 6, 2010.
- ALT. Lab Tests Online. http://www.labtestsonline.org/understanding/analytes/alt/glance.html. Accessed July 6, 2010.
- AST. Lab Tests Online. http://www.labtestsonline.org/understanding/analytes/ast/glance.html. Accessed July 6, 2010.
- ALP. Lab Tests Online. http://www.labtestsonline.org/understanding/analytes/alp/glance.html. Accessed July 6, 2010.
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