the reference ranges of some of the most frequently used in the clinical laboratory practice serum enzymes and isoenzymes are determined : aspartate aminotransferase ( asat ) , alanine aminotransferase ( alat ) , creatine kinase ( ck ) and its isoenzyme ( ck-mb ) , lactate dehydrogenase ( ldh ) and its isoenzyme -- hbdh , and alkaline phosphatase ( aph ) .
C0014442
enzymes
C0022173
isoenzyme