Specimen:
Collect
- One SST
Also Acceptable:
- One Green Top (Li Heparin)
- One Green Top (Na Heparin)
- One Red Top
Submit
- 1 mL (Min:0.5 mL) Serum . Submit Refrigerated. Submit in a Standard Transport Tube.
Also Acceptable:
- 1 mL (Min:0.5 mL) Plasma . Submit Refrigerated. Submit in a Standard Transport Tube.
Special Handling
- Separate from cells ASAP
- GFR is a calculation
Can add to a previous Serum Creatinine Result.
To estimate the glomerular filtration rate for African Americans, multiply the result provided by 1.21
Rejection Criteria
- Hemolyzed specimens
Stability
Ambient: 8 Hour(s); Refrigerated: 7 Day(s); Frozen: 1 Month(s); Incubated: Unacceptable
Performed
Mon-Fri
Reported
1-3 Day(s)
CPT Codes
- 82565
Interpretive Data
Please see report for interpretive data.
ESTIMATED GFR Reference Range:
GFR = Greater than or equal to 90: Normal or increased GFR.
GFR = 60-89: Mild decreased GFR.
GFR = 30-59: Moderate decreased GFR.
GFR = 15-29: Severe decreased GFR.
GFR = Less than 15: Kidney Failure.
When found over a three month period, GFR less than 60 indicates Chronic Kidney Disease.
GFR calculation is not valid for patients under age 18 years.
Please note: the equation for eGFR calculation has been updated to the 2021 CKD-EPI Creatinine equation as recommended by the National Kidney Foundation and Association for Diagnostics and Laboratory Medicine.
ESTIMATED GFR Reference Range:
GFR = Greater than or equal to 90: Normal or increased GFR.
GFR = 60-89: Mild decreased GFR.
GFR = 30-59: Moderate decreased GFR.
GFR = 15-29: Severe decreased GFR.
GFR = Less than 15: Kidney Failure.
When found over a three month period, GFR less than 60 indicates Chronic Kidney Disease.
GFR calculation is not valid for patients under age 18 years.
Please note: the equation for eGFR calculation has been updated to the 2021 CKD-EPI Creatinine equation as recommended by the National Kidney Foundation and Association for Diagnostics and Laboratory Medicine.
Components
- 1014 - CREATININE, SERUM
- 1040 - GFR ESTIMATION
Last Updated: April 23, 2025 @ 5:31 pm
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