How you prepare By Mayo Clinic Staff Print Certain foods and medicines can affect the results of your liver function tests. Your doctor will probably ask you to avoid eating food and taking some medicines before your blood is drawn. Request an appointment Doctors & Departments Sept. 12, 2023 Print Share on: FacebookTwitter Show references Diagnosing liver disease: Liver biopsy and liver function tests. American Liver Foundation. https://liverfoundation.org/liver-diseases/diagnosing-liver-disease. Accessed April 28, 2023. Laboratory tests of the liver and gallbladder. Merck Manual Professional Version. https://www.merckmanuals.com/professional/hepatic-and-biliary-disorders/testing-for-hepatic-and-biliary-disorders/laboratory-tests-of-the-liver-and-gallbladder. Accessed April 28, 2023. Friedman LS. Approach to the patient with abnormal liver biochemical and function tests. https://www.uptodate.com/contents/search. Accessed May 1, 2023. Blood tests. National Heart, Lung, and Blood Institute. https://www.nhlbi.nih.gov/health/blood-tests. Accessed May 1, 2023. ALT. Mayo Clinic Laboratories. https://www.mayocliniclabs.com/test-catalog/overview/8362#Clinical-and-Interpretive. Accessed May 1, 2023. AST. Mayo Clinic Laboratories. https://www.mayocliniclabs.com/test-catalog/overview/8360#Clinical-and-Interpretive. Accessed May 1, 2023. ALP. Mayo Clinic Laboratories. https://www.mayocliniclabs.com/test-catalog/overview/8340#Clinical-and-Interpretive. Accessed May 1, 2023. ALB. Mayo Clinic Laboratories. https://www.mayocliniclabs.com/test-catalog/overview/8436#Clinical-and-Interpretive. Accessed May 1, 2023. Total protein. Mayo Clinic Laboratories. https://www.mayocliniclabs.com/test-catalog/overview/8520#Clinical-and-Interpretive. Accessed May 1, 2023. Bilirubin. Mayo Clinic Laboratories. https://www.mayocliniclabs.com/test-catalog/overview/8452#Clinical-and-Interpretive. Accessed May 1, 2023. GGT. Mayo Clinic Laboratories. https://www.mayocliniclabs.com/test-catalog/overview/8677#Clinical-and-Interpretive. Accessed May 1, 2023. LD. Mayo Clinic Laboratories. https://www.mayocliniclabs.com/test-catalog/overview/8344#Clinical-and-Interpretive. Accessed May 1, 2023. PT. Mayo Clinic Laboratories. https://www.mayocliniclabs.com/test-catalog/Clinical+and+Interpretive/40934. Accessed May 1, 2023. Khanna S (expert opinion). Mayo Clinic. May 12, 2023. Liver function testsAboutDoctors&Departments Advertisement Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission. Advertising & Sponsorship Policy Opportunities Ad Choices Mayo Clinic Press Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press. Mayo Clinic on Incontinence - Mayo Clinic PressMayo Clinic on IncontinenceThe Essential Diabetes Book - Mayo Clinic PressThe Essential Diabetes BookMayo Clinic on Hearing and Balance - Mayo Clinic PressMayo Clinic on Hearing and BalanceFREE Mayo Clinic Diet Assessment - Mayo Clinic PressFREE Mayo Clinic Diet AssessmentMayo Clinic Health Letter - FREE book - Mayo Clinic PressMayo Clinic Health Letter - FREE book PRC-20394581 Patient Care & Health Information Tests & Procedures Liver function tests