A Comparison of the Accuracy of Different Single Plasma Sample Methods for Measuring Glomerular Filtration Rate Using 51Cr-EDTA in Children

다국어 초록 (Multilingual Abstract)

Purpose Among the different methods of measuring glomerular filtration rate (GFR) using 51Cr-ethylenediaminetetraacetic acidclearance, the two-plasma-sample method (TPSM) is widely used, and highly accurate. The single-plasma-sample method(SPSM) is occasionally used for simplicity, at the expense of accuracy. Our aims were (1) to investigate the correlation and(2) to compare the accuracy of six known SPSMs in pediatric patients in reference to TPSM.
Methods We retrospectively reviewed 122 pediatric cases (65 boys, age 7.3 ± 4.6 years) and analyzed 307 GFR measurements.
SPSMs included Groth and Aasted at 120 min, Hamat 120 min, Christensen and Groth at 120 and 240 min, and Jacobsson at 120and 240 min. Reference GFR (GFRref) was defined using TPSM GFR corrected by the Jodal and Brochner-Mortensen equation.
GFRref < 30 mL min−1 1.73 m−2 were excluded. The standard error of the estimate (SEE) and the number of cases withdifferences > 10% (N10%) were used to evaluate accuracy.
Results SPSMs generally correlated well with GFRref (r = 0.92~0.99) and were relatively accurate (SEE = 9.21~15.60). Grothand Aasted showed the smallest SEE, while Jacobsson at 240 min showed the smallest N10% for all GFRref ranges. As for thedecreased GFRref, Ham was most accurate followed by Jacobsson at 240 min.
Conclusions Jacobsson at 240 min provided good accuracy in all GFRref ranges and was well correlated with TPSM. Jacobsson at240 min might be the most appropriate method to substitute for TPSM in pediatric patients. Ham could be an alternative inpatients with impaired renal function.

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