Creatine Kinase (CK) & Exertional Rhabdomyolysis Calculator
Interpret serum Creatine Kinase (CK/CPK) blood levels after strenuous workouts, evaluate exertional rhabdomyolysis risks, and assess kidney injury warnings.
Calculated Results
Frequently Asked Questions
What does elevated Creatine Kinase (CK/CPK) signify?
Creatine Kinase is an enzyme found inside skeletal muscle tissue. Strenuous eccentric exercise (heavy squats, ultramarathons, CrossFit, downhill running) causes microscopic muscle fiber micro-tears that leak CK into the bloodstream.
What CK level constitutes clinical Rhabdomyolysis?
While normal resting CK is under 200 U/L, post-workout levels frequently rise to 1,000–3,000 U/L. Clinical exertional rhabdomyolysis is generally diagnosed when serum CK exceeds 5,000 U/L (or 5 to 10 times the upper limit of normal), often reaching 20,000 to 100,000+ U/L.
Why does rhabdomyolysis cause acute kidney failure?
When muscle cells disintegrate, massive amounts of myoglobin protein flood the bloodstream. Myoglobin precipitates in renal tubules and forms toxic casts that block filtration, precipitating Acute Kidney Injury (AKI).
What is the primary treatment for exertional rhabdomyolysis?
Aggressive intravenous (IV) fluid hydration (saline) is the frontline clinical therapy to maintain a high urine output (>200–300 mL/hr) and flush toxic myoglobin through the kidneys before tubular damage occurs.