Despite lack of clear evidence for a cut-off level, increased amounts of postvoid residual urine* is an accepted risk factor for UTI in the neurogenic population.¹

Anatomical abnormalities that limit complete bladder emptying are conditions in which lagoons of urine are difficult to empty during catheterization. This provides an environment for bacterial proliferation.²

What is the correlation between bladder shape and residual urine?

The reasons for experience residual urine could be many including anatomical bladder abnormalities, not proper education of patient, handling of IC catheter, and product choice (IC catheter)²

What do we need to consider?

There are no studies addressing these conditions, but it appears logical to accept such as risk factors. Such bladders may also have altered compliance, contributing to the UTI risk.²

^{*>100 ml}