Creatine Kinase and Isoenzymes
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CK and isoenzymes.
To monitor MI and some disorders of the musculoskeletal system, such as Duchenne muscular dystrophy.
There are no food, fluid, activity, or medication restrictions unless by medical direction.
Method: Enzymatic for CK, electrophoresis for isoenzymes; enzyme immunoassay techniques are in common use for CK-MB.
|Conventional and SI Units|
| Newborn–1 yr||Up to 2 × adult values|
| Male (children and adults)||50–204 units/L|
| Female (children and adults)||36–160 units/L|
|CK Isoenzymes by Electrophoresis|
|CK-MB by Immunoassay||0–5 ng/mL|
|CK = creatine kinase; CK-BB = CK isoenzyme in brain; CK-MB = CK isoenzyme in heart; CK‑MM = CK isoenzyme in skeletal muscle.The CK-MB index is the CK-MB (by immunoassay) divided by the total CK and then multiplied by 100. For example, a CK-MB by immunoassay of 25 ng/mL with a total CK of 250 units/L would have a CK-MB index of 10.Elevations in total CK occur after exercise. Values in older adults may decline slightly related to loss of muscle mass.|
Critical Findings and Potential Interventions
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Bladh, Mickey Lynn., and Anne M. Van Leeuwen. "Creatine Kinase and Isoenzymes." Davis's Lab & Diagnostic Tests, 7th ed., F.A. Davis Company, 2017. Nursing Central, nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425081/all/Creatine_Kinase_and_Isoenzymes.
Bladh ML, Van Leeuwen AM. Creatine Kinase and Isoenzymes. Davis's Lab & Diagnostic Tests. 7th ed. F.A. Davis Company; 2017. https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425081/all/Creatine_Kinase_and_Isoenzymes. Accessed October 14, 2019.
Bladh, M. L., & Van Leeuwen, A. M. (2017). Creatine Kinase and Isoenzymes. In Davis's Lab & Diagnostic Tests. Available from https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425081/all/Creatine_Kinase_and_Isoenzymes
Bladh ML, Van Leeuwen AM. Creatine Kinase and Isoenzymes [Internet]. In: Davis's Lab & Diagnostic Tests. F.A. Davis Company; 2017. [cited 2019 October 14]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Davis-Lab-and-Diagnostic-Tests/425081/all/Creatine_Kinase_and_Isoenzymes.
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