A client's lab report has just come in. The client's Creatinine Clearance (CrCl) is 25 mL/min (normal 120 mL/min for men and 95 mL/min for women). What has the nurse learned from this information?

A. The client has poor liver function: Creatinine clearance measures kidney filtration ability, not liver function. Abnormal CrCl values indicate renal impairment rather than hepatic dysfunction. Liver function is assessed using tests such as AST, ALT, and bilirubin levels. B. The client must be elderly: While creatinine clearance naturally declines with age, low CrCl can occur in adults of any age due to acute or chronic kidney disease. Age alone cannot be assumed as the cause of reduced renal function without additional context. C. The client has poor renal function: A CrCl of 25 mL/min is significantly below the normal range and indicates severe renal impairment. This value reflects decreased glomerular filtration rate, requiring adjustments in drug dosing, fluid management, and monitoring for accumulation of renally excreted medications. D. The client likely abuses alcohol: Alcohol consumption does not directly reduce creatinine clearance acutely, although chronic heavy use may contribute to liver disease or secondary renal damage. The CrCl value primarily reflects renal function and cannot be used alone to determine alcohol abuse.