Correlation between total urinary protein quantitation and random urine sample protein/creatinine ratio in children.
Random urine samples and 24-hour urine samples were obtained prospectively from 5 healthy children and 28 children with renal diseases, aged 2 to 14 years. The relationship between the random urine protein/creatinine ratio (Up/Ucr) and total daily protein excretion were studied. Protein concentrations were measured using a Coomassie blue binding technique. The Up/Ucr measured in 61 urine samples correlated closely with 24-hour urine protein excretion. In log-transformed data, the correlation was linear with a coefficient of 0.97 (log Up/Ucr mg/mmole = 0.786 + 1.018 logTP, TP in mg/h/M2). The Up/Ucr that coincided with a protein excretion of 4 mg/h/M2 was 25.1 mg/mmole (0.222 mg/mg) and of 40 mg/h/M2 was 261 mg/mmole (2.31 mg/mg). The results of our study indicate that Up/Ucr is an accurate estimate of quantitative protein excretion. In clinical practice this is a suitable method of quantification for proteinuria in patients with renal disease.
Tsai
W S
WS
Department of Pediatrics, National Taiwan University Hospital, Taipei, R.O.C.
Tsau
Y K
YK
Chen
C H
CH
Sheu
J N
JN
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003404:Creatinine / Q000652:urine*; D006801:Humans; D011446:Prospective Studies; D011507:Proteinuria / Q000652:urine*; D012044:Regression Analysis; D012494:Sampling Studies; D013997:Time Factors
D003404:Creatinine