The Alkaline Phosphatase (ALP) test is a key part of evaluating your liver and bone health. ALP is an enzyme found in high concentrations in the liver (in the bile ducts) and in your bones. Elevated levels, measured from a simple blood draw, often point to liver disease, bile duct blockages, or bone disorders. It's an essential component of a standard liver function panel. This test provides critical clues to help your doctor pinpoint the cause of abdominal pain or bone-related issues.