Learn what SGPT, SGOT, bilirubin and albumin mean, why liver blood tests can change, and which symptoms need medical attention.
An LFT, or liver function test panel, measures several substances in your blood. Doctors use the pattern to look for liver injury, problems with bile flow and changes in some liver functions. One highlighted result cannot identify the cause by itself. MedlinePlus: Liver function tests
What do the main names mean?
- ALT or SGPT: An enzyme found mainly in the liver. It can rise when liver cells are injured.
- AST or SGOT: Another enzyme, also present in muscles and other tissues. An increase does not always come from the liver. MedlinePlus: ALT blood test; MedlinePlus: AST test
- ALP and GGT: These help doctors assess the liver and bile ducts, which carry digestive fluid. ALP can also rise because of bone-related changes.
- Bilirubin: A waste substance produced when old red blood cells break down. The liver helps remove it.
- Albumin: A protein made by the liver. Low levels have several possible explanations, including kidney disease or poor nutrition. MedlinePlus: Liver function tests; MedlinePlus: Albumin blood test
Why might results be abnormal?
Possible causes include viral hepatitis, alcohol-related injury and effects of certain medicines. Recent illness or strenuous exercise may also affect some results. An abnormal result deserves a review, but it does not automatically mean permanent damage. The height of ALT alone does not tell you how much damage has occurred. MedlinePlus: ALT blood test
Fatty liver disease is another possible explanation, particularly alongside diabetes or other metabolic risk factors. Doctors may combine blood results with your history and imaging to assess it. An LFT alone cannot confirm fatty liver or measure liver scarring. NIDDK: Diagnosing fatty liver disease
What should you do next?
Use the reference intervals printed by your laboratory. Bring older reports so your doctor can compare changes rather than focusing only on the latest red mark. Share your symptoms and all medicines, herbal products and supplements you take. Ask whether the pattern needs repeat testing, hepatitis tests or an ultrasound. Your doctor decides which checks are useful. Ask which finding matters most, whether earlier results change the picture and when you should return. Write down the agreed follow-up plan so you know what to do after leaving the clinic.
Follow the preparation instructions given for your particular tests. Do not stop prescribed medicines yourself. Avoid trying a new “liver detox” or supplement to change the report; discuss products with your doctor first. MedlinePlus: ALT blood test; NHS: Cirrhosis and warning symptoms
When should you see a doctor?
Arrange review of unexplained or persistent abnormalities, even if you feel well. Seek prompt care for new yellow eyes or skin, dark urine, pale stools or increasing abdominal swelling. MedlinePlus: Liver function tests
Get emergency help for vomiting blood, black tarry stools or sudden confusion. These symptoms can be serious. Do not wait for another LFT or an online interpretation before seeking care. NHS: Cirrhosis and warning symptoms
Sources and further reading
- MedlinePlus: Liver function tests
- MedlinePlus: ALT blood test
- MedlinePlus: AST test
- MedlinePlus: Albumin blood test
- NIDDK: Diagnosing fatty liver disease
- NHS: Cirrhosis and warning symptoms
Editorial review and source check: 17 October 2026.
Medical disclaimer: This article provides general health information, not a diagnosis or a treatment plan. A qualified medical professional should interpret your results in the context of your health. Do not start, stop or change medicines based on this article.
© 2026 EndYourIllness. Original text. Third-party names and marks belong to their respective owners.
