The LAP test is a laboratory test conducted on the sample of blood to check the level of alkaline, phosphates and group of enzymes. These enzymes are found throughout the body, especially in liver, kidney, bile duct and in the placenta in a pregnant woman. It is primarily used in patients with an elevated White blood cell levels to differentiate reactive process from myelogenous leukaemia. A lower score on the test indicates that the person could have myolegenous Leukemia. This test is used very sparingly in the present.