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CK-MB Mass Unit Converter
CK-MB Mass measures the concentration of the myocardial-specific isoenzyme of Creatine Kinase (CK-MB). Since the advent of highly sensitive Troponin assays, CK-MB is no longer the primary marker for Acute Myocardial Infarction (AMI), but it remains valuable for assessing early reinfarction and evaluating cardiac damage in the setting of skeletal muscle injury (which elevates total CK).
The **Mass Assay** (ng/mL) is a superior and more specific method compared to the older **Activity Assay** (U/L). Clinically, the CK-MB Relative Index ($\frac{\text{CK-MB Mass}}{\text{Total CK Activity}} \times 100$) is used to confirm the cardiac origin of an elevated CK level (a ratio $> 2.5\%-3.0\%$ suggests myocardial damage). Results are reported in mass units (ng/mL or $\mu\text{g/L}$).
SI Units
RecommendedMicrograms per liter or Nanomoles per liter.
Conventional Units
Clinical Context
Reference Range: Normal serum CK-MB mass is typically < 5.0 ng/mL ($\mu\text{g/L}$). Values above $5.0 \text{ ng/mL}$ with clinical symptoms support the diagnosis of acute myocardial injury.
The CK-MB index helps rule out skeletal muscle injury. For example, in rhabdomyolysis, total CK is highly elevated, but the CK-MB index remains low ($< 2.5\%$). The conversion factor relies on the MW of CK-MB (86 kDa): 1 ng/mL $\approx$ 0.0116 nmol/L.
Clinical References
How to Use This Calculator
Follow these steps to get accurate clinical conversions instantly.
Enter Values
Input your laboratory results into the corresponding unit field (e.g., ng/mL). You can use either dot or comma decimals.
Automatic Conversion
The calculator works in real-time. As you type in one field, all other units (like $\mu\text{g/L}$ or $\text{pmol/L}$) are instantly updated.
Verify Units
Check the SI Units section. $\mu\text{g/L}$ is the standard SI mass concentration unit for this test.
Reset
Use the Clear button to reset all fields before starting a new calculation.
Frequently Asked Questions & Tips
Yes. $1 \text{ ng/mL}$ is exactly equivalent to $1 \mu\text{g/L}$.
The concentration is too small for $\text{mg/dL}$, leading to many decimal places. $\text{ng/mL}$ or $\mu\text{g/L}$ provides a more manageable whole number.