Creatine Kinase MM Isoenzyme (CK-MM)
Dimeric cytoplasmic enzyme composed of two M subunits (MM), localized in skeletal muscle sarcomeres to catalyze ATP regeneration.
Standard vs. Optimal Reference RangesU/L
Standard reference intervals represent the statistical 95% distribution of unselected commercial populations. Optimal longevity targets reflect clinical evidence for lowest cardiometabolic and all-cause mortality risk.
Your value falls within the optimal target associated with lowest disease risk and longevity.
30 - 200 U/L (>95% of total CK)
General reference distribution across unselected commercial populations.
40 - 150 U/L
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Reversibly transfers high-energy phosphate between ATP and phosphocreatine; released into plasma upon sarcolemmal membrane disruption.
Differential Diagnosis
Elevated Levels (CK-MM High)
- •Rhabdomyolysis (massive crush injury, extreme exertion, CK >10,000 U/L)
- •Duchenne and Becker muscular dystrophies
- •Polymyositis and dermatomyositis
- •Statin-induced myopathy
Low Levels (CK-MM Low)
- •Low muscle mass (severe sarcopenia, bedridden state)
- •Normal resting baseline
Technical Reference & Deep Dive
Biochemistry & Enzymatic Pathways
Longevity Risk Architecture & Epidemiology
Pre-Analytical Caveats & Diagnostic Workup
Pre-Analytical Considerations:
Specimen collection should follow standardized phlebotomy protocols. Protect from hemolysis, centrifuge promptly, and freeze serum or plasma if testing is delayed. Patient should be in a resting, fasting state where indicated.
Reflexive Testing Protocol:
- Confirmatory testing and secondary biomarker quantification for CK-MM
- Targeted organ system imaging or functional dynamic testing related to skeletal muscle sarcolemmal integrity
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Creatine Kinase MM Isoenzyme - The New England Journal of Medicine (2021). PMID: 34190124
- [2]CK-MM Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35422901
Associated Longevity Guides & Clinical Calculators
Medicine 3.0Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Creatine Kinase MM Isoenzyme (CK-MM) into overall healthspan optimization.