Creatinine helps to measure renal function and is more reliable than the BUN. This is because creatinine is not reabsorbed by the kidney and is readily excreted by the kidneys. If there is renal dysfunction, the kidneys will not properly filter and excrete waste (creatinine), and its value will rise in the serum.
The normal range for serum creatinine is 0.6 to 1.3 mg/dL.
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