ARUP's Laboratory Test Directory

Glomerular Filtration Rate, Estimated : 0020725

Mnemonic: GFRE

Methodology: Spectrophotometry
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect:  One 4 mL plasma separator tube or serum separator tube.

Storage/Transport Temperature:  1 mL plasma or serum at 2-8°C.  (Min: 0.2 mL)  Submit specimen in an ARUP Standard Transport Tube

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 (collection to initiation of testing):  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

CPT Code(s): 82565
Cross References: Estimated Glomerular Filtration Rate
 
 

 

 

 
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