Creatinine Serum

The amount of creatinine in your blood should be relatively stable. An increased level of creatinine may be a sign of poor kidney function. Serum creatinine is reported as milligrams of creatinine to a deciliter of blood (mg/dL) or micromoles of creatinine to a liter of blood (micromoles/L).

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Creatinine, which is a waste product produced by the muscles, gets filtered out by the kidneys. Your blood test result got flagged because a buildup of creatinine in the blood can be a sign of impaired kidney function. This can lead to chronic kidney disease.

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A normal result is 0.7 to 1.3 mg/dL (61.9 to 114.9 µmol/L) for men and 0.6 to 1.1 mg/dL (53 to 97.2 µmol/L) for women. Women often have a lower blood creatinine level than men. This is because women often have less muscle mass than men. Creatinine level varies based on a person's size and muscle mass.