Cardiac-specific isoenzyme of CK. Less sensitive than high-sensitivity troponin for MI but useful in suspected re-infarction (rises and falls more quickly than troponin).
| Sex | Age | Range | Notes |
|---|---|---|---|
| All | ≥ 18 yrs | < 5 | CK-MB mass; ratio CK-MB/total CK >6% suggests cardiac source |
⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.