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Lab Manual for SFGH

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GLOMERULAR FILTRATION RATE, ESTIMATED

Item Value
Available Stat? No
Test code N/A
Performed by? Chemistry
Sendout? no
Price range no charge
In House Availability Calculation with serum creatinine
Interpretation The estimated glomerular filtration rate is calculated from the following formula established from the Modification of Diet in Renal Disease Study(2,3), which is recommended by the National Kidney Foundation:

eGFR = 186.3 * (sCR)-1.154 * age-0.203 * (0.742 if female)

This calculated eGFR should be multiplied by 1.21 if the patient is African American. Because the chemistry laboratory does not always have access to race information, this correction must be applied by the user.

Because the accuracy of the eGFR calculation is poor when the creatinine is normal, we will only be reporting values if they reach the level of chronic kidney disease; i.e., < 60 mL/min/ 1.73 m2. The MDRD Study equation has not been validated in children (age < 18 years), pregnant women, the elderly (age > 70 years), or racial and ethnic subgroups other than Caucasians and African Americans.
Normal range
Age (y) Average GFR(mL/min/1.73m2)
20-29 116
30-39 107
40-49 99
50-59 93
60-69 85
≥ 70 75


Chronic kidney disease: < 60 mL/min/1.73m2
Kidney failure: < 15 mL/min/1.73m2

Synonyms GFR;
Stability N/A
References 1. Levey AS, Bosch JP, Lewis JB, Green T, Rogers N, Roth D. A more accurate method to estimate glomerular filtration rate from serum creatinine: a new prediction equation. Ann Intern Med 2000; 130:461-70.

2. Coresh J, Asator BC, McQuillan G, et al. Calibration and random variation of the serum creatinine assay as critical elements of using equations to estimate glomerular filtration rate. Am J Kidney Dis 2002; 39:920-29.

3. Hallan S, Asberg A, Lindberg M, Johnsen H. Validation of the modification of diet in renal disease formula for estimating GFT with special emphasis on calibration of the serum creatinine assay. Am J Kidney Dis 2004; 44:84-93.
Last Updated 11/12/2008 11:24:35 AM
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