Try again. This may tell you whether the ALP elevation is due primarily to cholestatically induced ALP vs. the corticosteroid-induced isoenzyme, but this distinction is not clinically valuable. An elevation in the corticosteroid-induced fraction may be due to either exogenous or endogenous steroids but it may also be elevated in cases of hepatobiliary disease. The bottom line-this test doesn't really add much to your work-up.
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