Cardiac Markers and Serum Enzymes

 

  • Creatine kinase (CK)
    • Male: 38 – 174 U/L
    • Female: 26 – 140 U/L
  • Creatinine kinase isoenzymes
    • CK-MM: 95% – 100% of total
    • CK-MB: 0% – 5% of total
    • CK-BB: 0%
  • Myoglobin: 5–70 ng/mL
  • Troponin:
    • Troponin: Less than 0.04 ng/mL; above 0.40 ng/mL may indicate MI
    • Troponin T: Greater than 0.1 to 0.2 ng/mL may indicate MI
    • Troponin I: Less than 0.6 ng/mL; >1.5 ng/mL indicates myocardial infarction
  • Atrial natriuretic peptide (ANP): 22 to 27 pg/mL
  • Brain natriuretic peptide (BNP): less than 100 pg/mL
  • C-type natriuretic peptide (CNP): reference range provided with results should be reviewed