About ALP
ALP (Alkaline Phosphatase) is an enzyme produced in the liver, bile ducts, and bones. In adults, elevated ALP most commonly indicates bile duct obstruction, liver disease, or bone disorders with increased turnover. Because ALP is produced by both liver and bone, GGT is used alongside it to identify the source: high ALP with high GGT points to the liver; high ALP with normal GGT points to bone.