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Common Use:
To assess kidney function found in acute kidney injury and chronic kidney disease, related to drug reaction and disease such as diabetes.

Serum collected in a red- or red/gray-top tube. Plasma collected in a green-top (heparin) tube is also acceptable.

Normal Findings:
(Method: Spectrophotometry)

AgeConventional UnitsSI Units (Conventional Units × 88.4)
Newborn0.31–1.21 mg/dL27–107 micromol/L
Infant0.31–0.71 mg/dL27–63 micromol/L
1–5 yr0.31–0.51 mg/dL27–45 micromol/L
6–10 yr0.51–0.81 mg/dL45–72 micromol/L
Adult male0.61–1.21 mg/dL54–107 micromol/L
Adult female0.51–1.11 mg/dL45–98 micromol/L

Values in older adults remain relatively stable after a period of decline related to loss of muscle mass during the transition from adult to older adult.

The National Kidney Foundation recommends the use of two decimal places in reporting serum creatinine for use in calculating estimated glomerular filtration rate.

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