[Evaluation of diagnostic parameters in chronic recurrent urinary tract infection in children. III. Pyuria, hematuria, and proteinuria (author's transl)].

Pyuria, proteinuria and haematuria have been shown to be unreliable parameters for the diagnosis of bacteriuria in 171 children with 455 recurrences of chronic urinary tract infection. Bacteriuria caused haematuria in 5%, proteinuria in 18% and even pyuria in only 47% of all instances. Pyuria has been also found in 11% of sterile urines. The incidence of pyuria increases with the age of the children and depends on the type of the organisms, but the latter was true mainly in children with obstructive lesions of the urinary tract. Children with repeated proteinuria during follow-up tend to have a higher incidence of pathologic findings on the i.v.-pyelogram.