Your doctor may ask you to avoid some types of medications, or they may ask you to avoid eating anything for a period of time before the test.
Be sure to continue drinking water prior to the test. You may want to wear a shirt with sleeves that can easily be rolled up to make it easier to collect the blood sample.
You may have your blood drawn in a hospital or at a specialized testing facility. To administer the test:. Blood draws are routine procedures and rarely cause any serious side effects. However, the risks of giving a blood sample can include:. After the test, you can usually leave and go about your life as usual. However, if you feel faint or lightheaded during the blood draw, you should rest before you leave the testing facility.
The results of these tests may not tell your doctor exactly which condition you have or the degree of any liver damage, but they might help your doctor determine the next steps. Your doctor will call you with the results or discuss them with you at a follow-up appointment. In general, if your results indicate a problem with your liver function, your doctor will review your medications and your past medical history to help determine the cause.
Your doctor may decide to test you for hepatitis, other infections, or other diseases that can affect the liver. They may also choose to do imaging, like an ultrasound or CT scan. They may recommend a liver biopsy to evaluate the liver for fibrosis, fatty liver disease, or other liver conditions.
Fatty liver, or hepatic steatosis, is a broad term that describes the buildup of fats in the liver. Too much fat in the liver can cause liver…. Learn about liver cancer symptoms, types, diagnosis, treatment, and prevention. Damage to the liver from excessive drinking can lead to ARLD.
Years of alcohol abuse cause the liver to become inflamed and swollen. The gamma-glutamyl transpeptidase test measures the amount of an important liver enzyme in your blood. Read on to learn more about the test and what…. The liver produces and clears cholesterol in the body.
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Activate Account. Create a New Account. Forgot Username or Password? Liver Function Tests What are some of the most common liver function tests? The most commonly performed blood tests include the following: Serum bilirubin test : This test measures the levels of bilirubin in the blood. Bilirubin is produced by the liver and is excreted in the bile. Elevated levels of bilirubin may indicate an obstruction of bile flow or a problem in the processing of bile by the liver.
Serum albumin test : This test is used to measure the level of albumin a protein in the blood and aides in the diagnosis of liver disease. Serum alkaline phosphatase test : This test is used to measure the level of alkaline phosphatase an enzyme in the blood. Alkaline phosphatase is found in many tissues, with the highest concentrations in the liver, biliary tract, and bone. This test may be performed to assess liver functioning and to detect liver lesions that may cause biliary obstruction, such as tumors or abscesses.
Serum aminotransferases transaminases : This enzyme is released from damaged liver cells. Prothrombin time PTT test : The prothrombin time test measures how long it takes for blood to clot.
Blood clotting requires vitamin K and a protein that is made by the liver. Prolonged clotting may indicate liver disease or other deficiencies in specific clotting factors. Alanine transaminase ALT test : This test measures the level of alanine aminotransferase an enzyme found predominantly in the liver that is released into the bloodstream after acute liver cell damage.
Aspartate transaminase AST test : This test measures the level of aspartate transaminase an enzyme that is found in the liver, kidneys, pancreas, heart, skeletal muscle, and red blood cells that is released into the bloodstream after liver or heart problems.
Gamma-glutamyl transpeptidase test : This test measures the level of gamma-glutamyl transpeptidase an enzyme that is produced in the liver, pancreas, and biliary tract. This test is often performed to assess liver function, to provide information about liver diseases, and to detect alcohol ingestion.
Lactic dehydrogenase test : This test can detect tissue damage and aides in the diagnosis of liver disease. This content does not have an Arabic version. Overview Liver function tests are blood tests used to help diagnose and monitor liver disease or damage.
Request an Appointment at Mayo Clinic. Share on: Facebook Twitter. Show references Diagnosing liver disease: Liver biopsy and liver function tests. American Liver Foundation. Accessed April 12, Laboratory tests of the liver and gallbladder. Merck Manual Professional Version.
Friedman LS. Approach to the patient with abnormal liver biochemical and function tests. Blood tests. National Heart, Lung, and Blood Institute. Mayo Medical Laboratories. Total protein. Kashyap PC expert opinion.
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