Nephrology · Emergency Medicine
McMahon Score for Rhabdomyolysis calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Allowed range: 18–110 years
Allowed range: 0.2–20 mg/dL
Allowed range: 4–16 mg/dL
Allowed range: 1000–500000 U/L
Allowed range: 0.5–20 mg/dL
Allowed range: 2–45 mmol/L
Result
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Clinical inputs
- Age (years)Accepted range: 18 to 110
- Sex
- Initial creatinine (mg/dL)Accepted range: 0.2 to 20
- Initial calcium (mg/dL)Accepted range: 4 to 16
- Initial creatine kinase (U/L)Accepted range: 1000 to 500000
- Cause of rhabdomyolysis
- Initial phosphate (mg/dL)Accepted range: 0.5 to 20
- Initial bicarbonate (mEq/L)Accepted range: 2 to 45
Primary source
McMahon GM, Zeng X, Waikar SS. A risk prediction score for kidney failure or mortality in rhabdomyolysis. JAMA Intern Med. DOI: 10.1001/jamainternmed.2013.9774. PMID: 24000014. Table 3: age >50 to ≤70 = 1.5, >70 to ≤80 = 2.5, >80 = 3; female = 1; creatinine 1.4 to 2.2 mg/dL = 1.5, >2.2 = 3; calcium <7.5 mg/dL = 2; CPK >40,000 U/L = 2; cause other than seizure, syncope, exercise, statin, or myositis = 3; phosphate 4.0 to 5.4 mg/dL = 1.5, >5.4 = 3; bicarbonate <19 mEq/L = 2. A score below 5 had a 3% risk of renal replacement or death in the derivation cohort; a score above 10 had a 59.2% risk. (2013)
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