Urinary Reflux Diagrams

Urinary reflux stages

Urinary reflux is graded 1 to 5. Grade 1 is the mildest form and grade 5 is the most severe.

Normal urinary tract

Grade 1 urinary reflux

Urine refluxes part-way up the ureter.

Grade 2 urinary reflux

Urine refluxes all the way up the ureter.

Grade 3 urinary reflux

Urine refluxes all the way up the ureter with some widening of the ureter and the part of the kidney where urine collects (calyces).

Grade 4 urinary reflux

Urine refluxes all the way up the ureter with a marked widening of the ureter and the part of the kidney where urine collects.

Grade 5 urinary reflux

Reflux of large amounts of urine up the ureter. Marked twisting and widening of the ureter and the part of the kidney where urine collects.