What is a regular serum creatinine level?

0.6 to 1.4 mg/dL. Creatinine is a product of muscle metabolism. Because women generally have less muscle mass than men, their values are lower. Because of increased volume during pregnancy, lower limits of normal may be 0.4 -0.5 mg/dl. As an individual ages, the muscle mass may decline therefore the serum creatinine values may not adequately reflect the underlying renal function.
Approx 1.0 mg/dL. Labs set their own normal values. More muscle means more creatinine. One kidney produces less creatinine. Dehydration increases creatinine.
0.7-1.25. Creatinine is the waste product of muscle breakdown and it produced at a steady rate irrespective of diet. Dehydration can increase the relative value of serum creatinine. The above value is for adults with normal kidney function.