Serum creatinine levels can vary according to a person's size, muscle mass and gender. Women have lower serum creatinine levels than men because they have less muscle mass. Serum creatinine test results can also vary depending on the laboratory performing the test and which lab method was used.
Typical serum creatinine ranges are 0.5 to 1.0 milligrams per deciliter for women and 0.7 to 1.2 mg/dl for men. A serum creatinine level of 2.0 mg/dl may indicate normal kidney function in a male bodybuilder, but 0.7 mg/dl can indicate significant renal disease in a frail old woman. The ability to look at changing levels over time is more informative for patients and doctors than is a single measurement at one point in time. For example, a serum creatinine level of 1 mg/dl might be considered normal -- unless it recently increased from 0.6, which would make it very abnormal.
The following conditions may cause serum creatinine levels to be higher than normal:
The following conditions may cause serum creatinine levels to be lower than normal:
- A muscle disease, such as myasthenia gravis or muscular dystrophy
- A diet with too little protein
The links on the next page will give you more information about kidney disease and heart disease.