What is the normal reference range for ALP?

What is the normal reference range for ALP?

• A. 20-80
• B. 50-150
• C. 40-120
• D. 60-140

Answer: (C)

Alkaline phosphatase (ALP) is an enzyme used to assess liver and bone conditions. The normal reference range most commonly cited for adults is about 40 to 120 U/L, though exact cutoffs can vary by laboratory. This range sits in the typical middle of what many labs report, making it the best choice among the options. Values below 40 are generally considered low, and values above 120 suggest increased bone activity (as in growth, healing, or some bone disorders) or biliary/cholestatic liver issues, prompting further evaluation. Note that in children, ALP can be higher due to bone growth, and some labs may use slightly different references.

Alkaline phosphatase (ALP) is an enzyme used to assess liver and bone conditions. The normal reference range most commonly cited for adults is about 40 to 120 U/L, though exact cutoffs can vary by laboratory. This range sits in the typical middle of what many labs report, making it the best choice among the options. Values below 40 are generally considered low, and values above 120 suggest increased bone activity (as in growth, healing, or some bone disorders) or biliary/cholestatic liver issues, prompting further evaluation. Note that in children, ALP can be higher due to bone growth, and some labs may use slightly different references.