| Test | Conventional | SI | Threshold |
|---|---|---|---|
| B-type Natriuretic Peptide (BNP) | < 100 (heart failure unlikely) pg/mL | < 100 ng/L | - |
| CK-MB | < 5 (or < 5% of total CK) ng/mL | < 5 µg/L | - |
| Creatine Kinase (CK) | 30-200 U/L | 0.5-3.34 µkat/L | Marked elevation (thousands) suggests rhabdomyolysis |
| Myoglobin | 25-72 ng/mL | 25-72 µg/L | - |
| NT-proBNP | < 125 (age < 75); < 450 if older pg/mL | < 125 ng/L | - |
| Troponin I | < 0.04 (assay-dependent) ng/mL | < 0.04 µg/L | Any elevation above the 99th percentile signals myocardial injury |
| Troponin T | < 0.01 (assay-dependent) ng/mL | < 0.01 µg/L | Elevation above the assay's 99th percentile indicates myocardial injury |
Panel
Cardiac Markers
Troponin, CK-MB, myoglobin, and the natriuretic peptides. 7 tests, 3 with a taught threshold.
Printable cheat sheet
Take this panel with you
Free for everyone. Opens your browser's print dialog with a clean, single-panel layout - every Cardiac Markers test, range, and critical value. Save as PDF or print to paper.
PremiumPut several panels on one sheet
This sheet is one panel. The Premium study sheet builder combines any of the 15 panels into a single printable sheet - a whole exam's worth of ranges and critical values on one page instead of 15 separate printouts. Free builds 1 panel at a time, and every panel page stays free to read and print on its own.
Frequently asked questions
What tests are in a Cardiac Markers?
The Cardiac Markers on this page lists 7 tests: B-type Natriuretic Peptide (BNP), CK-MB, Creatine Kinase (CK), Myoglobin, NT-proBNP, Troponin I, Troponin T. Each is shown with its conventional and SI teaching reference range.
What does the Cardiac Markers check for?
Troponin, CK-MB, myoglobin, and the natriuretic peptides. These are educational teaching values - ranges vary by laboratory and method, and are not for clinical decisions.
Which Cardiac Markers values are critical?
3 of the 7 tests in this Cardiac Markers carry a taught threshold: Creatine Kinase (CK) (Marked elevation (thousands) suggests rhabdomyolysis); Troponin I (Any elevation above the 99th percentile signals myocardial injury); Troponin T (Elevation above the assay's 99th percentile indicates myocardial injury). These are teaching thresholds, not clinical cutoffs - always use the values your laboratory reports.