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The more muscle a person has, the more creatinine they produce. Levels of creatinine in the blood reflect both the amount of muscle a person has and their amount of kidney function. Most men with normal kidney function have approximately 0.6 to 1.2 milligrams/deciliters (mg/dL) of creatinine. Most women with normal kidney function have between 0.5 to 1.1 mg/dL of creatinine. Women usually have lower creatinine levels than men because women, on average, have less muscle than men. Other factors that may affect the level of creatinine in the blood include body size, activity level and medications.
A creatinine blood test measures the level of creatinine in the blood. Creatinine is a waste product that forms when creatine breaks down.Creatine is a substance found in muscle.Creatinine levels help determine how well your kidneys function. Your kidneys are responsible for eliminating creatinine from the body when you urinate. When creatinine levels increase, your kidney function may be impaired.nderstanding Your Results: Normal Creatinine Levels. Creatinine is measured in milligrams per deciliter of blood (mg/dL). People who are more muscular tend to have higher creatinine levels. Normal creatinine levels range from 0.7 to 1.3 mg/dL in men and 0.6 to 1.1 mg/dL in women.