Extremely elevated creatine kinase associated with rhabdomyolysis-induced acute kidney injury in a patient with Huntington's disease: a case report.

Background: Rhabdomyolysis-induced acute kidney injury is a serious condition that can progress to acute renal failure if not promptly identified and treated. Rhabdomyolysis occurs when serum creatine kinase levels approach > 1000 U/L (five times the normal upper limit). The chance of acute kidney injury increases as the levels of creatine kinase increase.