Age

< 50 years+0≥ 50 years+2

Sex

Male+0Female+1

Cause of Rhabdomyolysis

Exertional (exercise, heat stroke)+0Statin-induced or myositis+0Other non-ischemic cause+1Ischemia (vascular, compartment syndrome)+3Immobility/coma (prolonged collapse, seizure with prolonged postictal)+3

Initial Serum Creatinine

< 1.4 mg/dL (< 124 µmol/L)+0≥ 1.4 mg/dL (≥ 124 µmol/L)+3

Initial Serum Calcium

> 8.0 mg/dL (> 2.0 mmol/L)+07.5–8.0 mg/dL (1.88–2.0 mmol/L)+1< 7.5 mg/dL (< 1.88 mmol/L)+2

Initial Serum Bicarbonate

≥ 19 mEq/L+0< 19 mEq/L+2

Initial Serum Phosphate

≤ 4.0 mg/dL (≤ 1.29 mmol/L)+0> 4.0 mg/dL (> 1.29 mmol/L)+3

Decreased or Altered Consciousness at Presentation

Absent (alert and oriented)+0Present (GCS < 15, confusion, or lethargy)+2

McMahon Score for Rhabdomyolysis

McMahon Score for Rhabdomyolysis