What is the normal serum creatinine range for adult females?

• A. About 0.6-1.2 mg/dL
• B. About 0.7-1.3 mg/dL
• C. About 0.4-0.9 mg/dL
• D. About 0.5-1.1 mg/dL

Answer: (D)

Creatinine comes from muscle metabolism and is cleared by the kidneys; because women generally have less muscle mass, their normal range is a bit lower than men. A commonly cited reference for adult females is about 0.5 to 1.1 mg/dL. This interval accounts for typical individual variation and lab differences, providing a practical range to recognize normal kidney filtration. Values above this range can indicate reduced kidney function or other factors raising creatinine, while values within it reflect normal clearance. Remember that hydration, body size, age, meds, and the specific assay can shift the exact numbers a bit, but 0.5–1.1 mg/dL is a good standard for adult females.