What Is a Normal Serum Creatinine Level?

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A normal serum creatinine level ranges from 0.6 to 1.1 milligrams per deciliter in women and 0.7 to 1.3 milligrams per deciliter in men, states MedlinePlus. Men usually have a greater muscle mass than women, which results in their having a higher serum creatinine level than that of women. The creatinine test is used to determine how well the kidneys function.