Simplified quantification of urinary protein excretion in children with nephrotic syndrome.

Objective: To assess the value of single voided random (spot) urinary protein to creatinine ratio in accurately predicting the 24-hour urinary protein excretion in Pakistani pediatric population with nephrotic syndrome.

Design: Cross-sectional, analytical study.

Place And Duration Of Study: The Pediatric Department, Nishtar Hospital/ Children Complex, Multan, from January 2003 to November, 2005.

Patients And Methods: Fifty seven children between 1-18 years with nephrotic syndrome were included. Seventy pairs of spot urine (5 milliliter) and 24-hour urine were collected in different phases of their disease e.g. initial, induction and remission. The protein to creatinine ratio was determined in spot urine samples and total protein content in 24-hour urine samples. The correlation between the ratio and 24-hour urinary protein excreted was determined using Pearson's coefficient (r) linear regression analysis.

Results: The protein to creatinine ratio in a spot urine sample was significantly correlated with the 24-hour urinary protein. The correlation coefficient (least square method) was found to be significant (r=0.9444). A random (spot) urinary protein to creatinine ratio of greater than 2 correlated well with the massive proteinuria (i.e. nephrotic syndrome), between 2 to 0.2 indicated glomerulopathy while a ratio of less than 0.2 was suggestive of physiological values.

Conclusion: The random spot urinary protein to creatinine ratio can reliably be used to assess the degree of proteinuria in children with nephrotic syndrome and can replace the 24-hour urinary protein excretion/collection.