Creatine Kinase Isoenzymes (CK Isoenzymes) with Total CK

Catalog information reviewed: August 24, 2026 by the Sunridge Medical clinical team.

What this laboratory test evaluates

DetailsCreatine Kinase Isoenzymes (CK Isoenzymes) with Total CK – This test measures creatine kinase (CK), an enzyme found primarily in striated muscle and heart tissue, and may be useful in assessing muscle damage. Total CK and fractions of CK isoenzymes are reported. CK is a dimeric enzyme composed of either 2 B subunits (CK-BB), 2 M subunits (CK-MM), or an M and a B subunit (CK-MB). CK-MM is the primary isoenzyme found in the skeletal muscle and heart tissue. CK-BB is mainly found in the brain and smooth muscle of gastrointestinal tract and urinary bladder. CK-MB is mainly found in the heart with a small amount in skeletal muscle [1].

An increase in the CK level is often observed in inflammatory myopathy (eg, viral myositis, polymyositis, and immune-mediated myopathies), muscular dystrophy (eg, Duchenne sex-linked muscular dystrophy), rhabdomyolysis, or malignant hyperthermia [1]. In patients with neuromuscular disorders, an increased CK level may be the only initial manifestation [1].

Other causes of elevated CK levels include hypothyroidism, direct muscle trauma (eg, surgery and intramuscular injection), excessive exercise, and certain medications (eg, statins, fibrates, antiretrovirals, and angiotensin II receptor antagonists) [1].

The quantitation of CK-MB levels in serum was widely used to diagnose acute myocardial infarction but has been replaced by troponin I and T levels, which are more cardiac-specific [2,3]. CK-MB measurement, preferably expressed as CK-MB relative to the total CK level, is only indicated in patients with suspected acute coronary syndrome or reinfarction when troponin T and I testing are not available [2].

In individuals with chronic muscle damage/disease or chronic renal failure, CK-MB may account for the elevation of CK levels owing to the phenomenon of "fetal reversion" [1].CK-BB levels may be increased in newborns with brain damage or very low birth weight, although healthy newborns can also have increased CK-BB levels as a result of birth-related muscle trauma [1].

The results of this test should be interpreted in the context of pertinent clinical and family history and physical examination findings.

References
1. Panteghini M, et al. Serum enzymes. In: Rifai N, et al. eds. Tietz Textbook of Laboratory Medicine. 7th ed. Elservier Inc; 2022:4149-4299.
2. CKMB: optimal testing recommendations. AACC. Accessed October 11, 2022. https://www.aacc.org/advocacy-and-outreach/optimal-testing-guide-to-lab-test-utilization/a-f/ckmb
3. Gulati M, et al. Circulation. 2021;144(22):e368-e454.

What type of sample is required for this test?2 mL frozen serum

Test ResourcesFor more information, please consult your healthcare provider.

Additional test information

Creatine Kinase Isoenzymes (CK Isoenzymes) with Total CK – This test measures creatine kinase (CK), an enzyme found primarily in striated muscle and heart tissue, and may be useful in assessing muscle damage. Total CK and fractions of CK isoenzymes are reported. CK is a dimeric enzyme composed of either 2 B subunits (CK-BB), 2 M subunits (CK-MM), or an M and a B subunit (CK-MB). CK-MM is the primary isoenzyme found in the skeletal muscle and heart tissue. CK-BB is mainly found in the brain and smooth muscle of gastrointestinal tract and urinary bladder. CK-MB is mainly found in the heart with a small amount in skeletal muscle.

Collection and processing

• Sample type: Serum
• Fasting: No
• Estimated laboratory processing: Results should be available in 2 – 5 business days after the sample is collected

How Sunridge uses laboratory information

Sunridge considers the medical question, symptoms, history, medications, prior results, and whether the finding could change care before recommending testing. A laboratory result is not interpreted in isolation and does not establish a diagnosis by itself.

Before requesting this test

Availability, collection requirements, eligibility, and processing estimates can change. Sunridge reviews each request and, when appropriate, creates the order through Fullscript. Follow the current instructions supplied with the approved order.