Liver function tests (also called LFTs) are blood tests that can provide information about

how the liver is working. They test the levels of a number of proteins and enzymes that are either produced by liver cells or released into the blood when liver cells are damaged.These tests include prothrombin time (PT/INR), activated Partial Thromboplastin Time (aPTT), albumin, bilirubin (direct and indirect), and others.Liver function tests can be used to: Screen for liver infections, such as hepatitis. Monitor the progression of a disease, such as viral or alcoholic hepatitis, and determine how well a treatment is working. Measure the severity of a disease, particularly scarring of the liver (cirrhosis)