Liver Profile Test

LFT are used to assess function of liver which may be altered during liver infections, non-infectious conditions or injury. This test is not usually a part of battery of other tests recommended to diagnose a disease.
LFT can be used to monitor progression of diseases i.e., viral or alcoholic hepatitis, and their response to treatment
It is also done to monitor side effects of medications i.e., Isoniazid, Rifampicin & Pyrazinamide treatment for tuberculosis

Liver profile test measures bilirubin levels (direct, total), AST, ALT, total proteins, albumin, ALP

Liver Profile test requires a blood sample. A tourniquet (elastic) band is placed tightly on the upper arm. The patient is then asked to make a fist. This helps in the build-up of blood filling the veins. The skin is disinfected before needle insertion and the blood sample is collected in vacutainer.

Ideally all parameters should be within the biological reference range. High levels are associated with certain diseases.
High ALT is associated with liver damage
High AST is associated with liver, muscle or other organ damage or disease. In isolated liver damage rise in ALT n AST is disproportionate to ALP 
High ALP is associated with blocked bile duct, or certain bone diseases and rise in such conditions is disproportionate to AST & ALT
Low proteins may be associated with liver disease or damage
High bilirubin might indicate liver damage (increase in direct bilirubin) or disease or certain types of anaemia (increase in indirect bilirubin)
High GGT may indicate bile duct damage. It may increase in hepatitis, liver cancer, acute heart condition. But together with ALP can help pinpoint liver related disorders
High Prothrombin time may be due deficiency of coagulation factors or due to deficiency of Vitamin K or due to anticoagulants being administered
LDH is increased in diseases involving blood (megaloblastic & pernicious anaemia), heart, liver, lung, kidney and other organs. In Hodgkin's disease and multiple myeloma