Collect: One 4 mL plasma separator tube or serum separator tube.
Transport: 1 mL plasma or serum at 2-8°C. (Min: 0.2 mL) Submit specimen in an ARUP Standard Transport Tube
Pediatric Collection/Transport: 0.2 mL plasma or serum at 2-8°C.
Remarks: Allow serum to clot completely at room temperature. Separate serum or plasma from cells ASAP.
Unacceptable Conditions: Specimens obtained through catheters used to infuse hyperalimentation fluid. Specimens in potassium oxalate/sodium fluoride or sodium citrate tubes.
Stability: After separation from cells: Ambient: 4 hours; Refrigerated: 1 week; Frozen: 6 months
Reference Interval:
Creatinine
Age
Male
Female
1-30 days
0.5-1.2 mg/dL
0.5-0.9 mg/dL
31-364 days
0.4-0.7 mg/dL
0.4-0.6 mg/dL
1-3 years
0.4-0.7 mg/dL
0.4-0.7 mg/dL
4-6 years
0.5-0.8 mg/dL
0.5-0.8 mg/dL
7-9 years
0.6-0.9 mg/dL
0.5-0.9 mg/dL
10-12 years
0.6-1.0 mg/dL
0.6-1.0 mg/dL
13-15 years
0.6-1.2 mg/dL
0.7-1.1 mg/dL
16-18 years
0.8-1.4 mg/dL
0.7-1.1 mg/dL
19 years and older
0.4-1.2 mg/dL
0.4-1.2 mg/dL
Calculation
By report
Interpretive Data:
To estimate the glomerular filtration rate for African Americans, multiply the result provided by 1.21. The equation used to estimate the glomerular filtration rate has only been validated for patients 18 to 70 years of age.
Stage
GFR
Stage 1 Stage 2 Stage 3 Stage 4 Stage 5
90 mL/min/1.73 square meters or greater 60-89 mL/min/1.73 square meters 30-59 mL/min/1.73 square meters 15-29 mL/min/1.73 square meters 14 mL/min/1.73 square meters or less