What is the normal serum creatinine range for adult males?

• A. About 0.8-1.6 mg/dL
• B. About 0.6-1.2 mg/dL
• C. About 0.4-0.9 mg/dL
• D. About 1.0-2.0 mg/dL

Answer: (B)

Normal serum creatinine is a marker of kidney filtration and is influenced by muscle mass. In healthy adult men, the typical reference range is about 0.6 to 1.2 mg/dL. This range reflects normal creatinine production from muscle and normal renal clearance. Values above this range can indicate reduced glomerular filtration or higher muscle mass, while values below are less common but can occur with very low muscle mass. The range 0.6–1.2 mg/dL best matches the standard adult male reference, so it fits as the correct choice.