Isoenzymes and Clinical Enzymology
Start with the big picture
Clinical enzymology uses enzyme activity and isoenzyme patterns to support assessment of tissue injury. Electrophoresis, ion-exchange chromatography, and immunoassays can distinguish variants, while interpreting results requires attention to tissue distribution and clinical context. The topic surveys CK and LDH patterns associated with myocardial injury; AST, ALT, ALP, and GGT in liver and biliary assessment; and amylase and lipase in pancreatitis. It also covers ACP, cholinesterases, troponins, and myoglobin, including how their diagnostic roles differ. Biomarkers vary in specificity and timing: for example, myoglobin rises early but is nonspecific, whereas troponins have high myocardial specificity and remain elevated longer. The lesson also addresses enzyme measurement, diagnostic patterns, reference ranges, and common interpretation traps.
What you'll learn
- Define isoenzymes and describe how their properties support tissue-source identification.
- Name laboratory techniques used to separate or identify isoenzyme forms.
- Compare the diagnostic roles of CK, LDH, liver enzymes, and pancreatic enzymes.
- Distinguish cardiac troponins from myoglobin by specificity and timing.
- Interpret selected enzyme patterns while recognizing common diagnostic limitations.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
