What is the normal serum creatinine range for adults?

What is the normal serum creatinine range for adults?

• A. 0.2–0.6 mg/dL
• B. About 0.6–1.3 mg/dL (varies with muscle mass)
• C. 1.5–2.0 mg/dL
• D. 0.8–1.2 mg/dL

Answer: (B)

Serum creatinine levels reflect how much muscle mass a person has, because creatinine is produced from muscle and the kidneys clear it. In adults, the amount produced—and thus the level in the blood—varies with muscle mass, sex, age, and race. Because of this, there isn’t a one-size-fits-all number. A normal range that accounts for this variability is about 0.6 to 1.3 mg/dL, recognizing that individuals with more muscle may sit toward the higher end and those with less muscle toward the lower end. The other ranges are less representative of the real-world adult population: 0.2–0.6 mg/dL is too low for most adults, 1.5–2.0 mg/dL is typically outside normal and suggests reduced kidney function or unusual muscle mass, and 0.8–1.2 mg/dL is narrower and doesn’t reflect the muscle-mass-related variation seen in many adults.

Serum creatinine levels reflect how much muscle mass a person has, because creatinine is produced from muscle and the kidneys clear it. In adults, the amount produced—and thus the level in the blood—varies with muscle mass, sex, age, and race. Because of this, there isn’t a one-size-fits-all number. A normal range that accounts for this variability is about 0.6 to 1.3 mg/dL, recognizing that individuals with more muscle may sit toward the higher end and those with less muscle toward the lower end.

The other ranges are less representative of the real-world adult population: 0.2–0.6 mg/dL is too low for most adults, 1.5–2.0 mg/dL is typically outside normal and suggests reduced kidney function or unusual muscle mass, and 0.8–1.2 mg/dL is narrower and doesn’t reflect the muscle-mass-related variation seen in many adults.