Factors Affecting Accurate Quantitation of Proteinuria Using Protein/Creatinine Ratio in Random Urine Specimen / 대한신장학회잡지

ABSTRACT

It's well known that protein/creatinine ratio(P/C ratio) in random urine samples reflects 24-hour urine protein. However, the factors affecting accurate quantitation of proteinuria using random urine P/C ratio are not fully evaluated. The aim of this study is to evaluate factors affecting accurate quantitaion of proteinuria using random urine P/C ratio. 118 patients admitted in Yonsei university medical center during June 1998 and Dec. 1998 were assessed for the measurement of random urine protein/creatinine ratio from second voided urine. 118 patients(mean age 41.5year, male female 2.36 1) had mean creati-nine level 1.83+/-1.78mg/dL, 24-hour pmteinuria 6.06+/-7.64g/day and P/C ratio 4.80+/-4.48, All the patiient.s were divided into A, B, C, I, II, K, IV according to serum creatinine level and 24-hour proteinurim amount. The correlation coefficient(R value) between proteinuria and P/C ratio are shown that in all pa- tients is 0.875, group A(Cr* serum creatinine, mg/dL, **24-hr pro 24-hour urine protein amount, g/day). Greater amount of proteinuria in 24-hour urine less correlated in sensitivity, specificity and positive predictive value with random urine P/C ratio. To evaluate factors affecting accurate quantitation of proteinuria by P/C ratio, multiple regression analysis was performed. The factors affecting accurate quantitation of proteinuria using random urine P/C ratio was 24-hour urine protein amount, not serum creatinine. Especially, in the patients with 24-hour pro-teinuria less than 4.0g/day, the random urine P/C ratio predicted 24-hour urine protein amount most accurately. In conclusion, random urine P/C ratio was well correlated with 24-hour proteinuria in the non-ne-phrotic range proteinuria especially, under 4.0g/day, irrespective of serum creatinine level.