Proteinuria selectivity index in Saudi children with nephrotic syndrome.

Proteinuria selectivity index (PSI) was determined in 54 Saudi children with nephrotic syndrome whose renal biopsy showed minimal change in 13 and non-minimal histologic changes in 41 patients. The selectivity was determined with two pairs of proteins, IgG/transferrin and IgG/albumin. There was considerable overlap in the values of PSI in patients with minimal and non-minimal histological changes. The clinical utility of PSI in differentiating minimal change nephrotic syndrome and non-minimal change nephrotic syndrome is low.