| Test Name: |
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Estimated Glomerular Filtration Rate (e-GFR)
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| Test Code(s): |
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CRET
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| CPT Code(s): |
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82565
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| Test Description: |
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Test Component: Blood creatinine must be ordered for e-GFR to be calculated. Calculated on adult outpatients.
Included In: Creatinine, Basic Metabolic Panel, Comprehensive Metabolic Panel
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| Clinical Significance: |
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Calculation is used to estimate glomerular filtration rate (GFR) from serum or plasma creatinine. E-GFR is automatically calculated on UWHC Outpatients aged 18 years and up. The test may be requested on inpatients aged 18 years and up (HealthLink code: HCEGFR).
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| Days Performed: |
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Daily, 24 hours.
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| Turnaround Time: |
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Stat: 1 hour.
Routine: 4 hours.
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Specimen Requirements
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| Specimen: |
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Blood
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| Collection Container: |
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Preferred: Green cap with yellow ring (PST)
Also Acceptable:
Green top,
Red cap with yellow ring (SST),
Red top
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| Collection Volume: |
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Preferred: 1 mL
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| Sample Analyzed: |
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Plasma or serum
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| Volume Required: |
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Preferred: 0.5 mL
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| Specimen Processing: |
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Centrifuge. If a complete barrier has not formed, transfer cell-free plasma/serum to plastic vial.
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| Specimen Transport: |
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Transport specimen to the laboratory. Transport with coolant pack if coming from outreach location.
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Interpretation
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Reference Interval:
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18 years and up: 60-120 mL/min/1.73 sqm
e-GFR Interpretive Statement:
Chronic kidney disease: e-GFR < 60 mL/min/1.73 sqm
Kidney failure: e-GFR < 15 mL/min/1.73 sqm
*For African Americans multiply reported e-GFR result by 1.210.
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| Additional Information: |
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Estimated Glomerular Filtration Rate calculation uses the MDRD National Kidney Foundation calculation for IDMS creatinine methods. See the following website for this calculation: http://www.kidney.org/professionals/kdoqi/gfr_page.cfm
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