Medical Definition of alkaline phosphatase
: any of the phosphatases that are enzymes active chiefly in alkaline medium and occur in especially high concentrations in bone, the liver, the kidneys, and the placenta <Normally, blood levels of alkaline phosphatase, which are a measure of bone cell growth and bone rebuilding, begin declining with age and remain very low throughout old age.—Sally Squires, The Washington Post, 18 July 1989> ◆A test measuring the level of alkaline phosphatase in the blood serum is an important diagnostic indicator for diseases especially of the bone, liver, gallbladder, and bile ducts. —compare acid phosphatase
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