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The reference range for creatinine is 50 to 110 Î¼mol/L (0.8 - 1.4 mg/dl). Men tend to have higher levels of creatinine because they have more skeletal muscle than women. Serum creatinine is not affected by diet or activity level.reatinine. Creatinine is a breakdown product of creatine phosphate in muscle, and is usually produced at a fairly constant rate by the body (depending on muscle mass). It is filtered by the kidney. If the filtering of the kidney is deficient, blood levels rise. This effect is used as an indicator of renal function.
Quick Answer. The typical adult range for the BUN-to-creatinine ratio is 1 unit of creatinine for every 10 to 20 units of blood-urea nitrogen, states Lab Tests Online. However, WebMD claims the levels are normal if the ratio falls between 6 and 25 units of blood-urea nitrogen per unit of creatinine. Continue Reading.