Liver Function Tests (LFT) are a group of blood tests used to assess liver health and identify signs of liver injury, inflammation, or problems affecting bile flow. An LFT profile commonly includes measurements such as ALT, AST, alkaline phosphatase (ALP), bilirubin, albumin, and total protein.
What Does an LFT Test Check?
A liver function test provides useful information about how the liver is functioning and can help doctors evaluate abnormal liver enzymes. ALT and AST may increase when liver cells are damaged, while bilirubin and ALP can provide additional information about bile flow and related conditions. Albumin helps assess a protein produced by the liver.
When Is an LFT Recommended?
Doctors may recommend an LFT blood test during routine health screening or when symptoms such as fatigue, nausea, abdominal discomfort, jaundice, dark urine, itching, or loss of appetite are present. It may also be used to monitor an existing liver condition or assess the effects of certain medicines.
Preparation and Results
LFTs require a blood sample collected from a vein and usually take only a few minutes. Depending on the tests ordered, fasting may be required. Tell your healthcare provider about medicines, vitamins, and supplements you take, and follow the laboratory's specific instructions.
Abnormal LFT results do not automatically confirm liver disease. Results should be interpreted alongside symptoms, medical history, reference ranges, and other investigations by a qualified healthcare professional.