But for a subgroup of patients, a relapse of "cystitis" within 4 weeks can signal a subclinical, "silent," pyelonephritis. A 14-day course of antibiotics is indicated to treat the recurrent UTI.

A urinalysis documenting the presence of pyuria (ie, WBCs in the urine) and bacteriuria suggests a clinical diagnosis of UTI. A microscopic full urinalysis should also be done whenever a urine ...