An alkaline phosphatase level test (ALP test) measures the amount of alkaline phosphatase enzyme in your bloodstream

Alanine transferase (ALT) is an enzyme which is produced by the liver and can indicate liver damage caused by alcohol, drugs or viruses (hepatitis). Small amounts of ALT are normal, but raised levels may indicate that your liver is inflamed.

Elevated levels of ALT can also be caused by recent vigorous exercise.

Creatine kinase (CK) is an enzyme chiefly found in the brain, skeletal muscles, and heart. An elevated level of creatine kinase is seen in heart attacks, when the heart muscle is damaged, or in conditions that produce damage to the skeletal muscles or brain.

The level of Creatine Kinase in the blood is measured to assess muscle damage – it can rise very quickly after muscle trauma, but will begin to lower as the damage is repaired. If Creatine Kinase continues to rise it indicates that muscle damage is not being repaired.

Gamma-glytamyl transpeptidase (GGT) is an enzyme which is found in hepatocytes and biliary epithelial cells. GGT may be high in liver disease. Gamma GT is also used to diagnose alcohol abuse as it is raised in 75% of long term drinkers.