In simple words: The doctor uses a special tool (a manometer) to measure the pressure of fluids in the kidneys and ureters. This helps check for blockages or problems with urine flow from the kidneys.

This procedure involves connecting an indwelling ureteral catheter or an existing nephrostomy or pyelostomy tube to a manometer line to measure fluid pressure or pressure variations within the kidneys and ureters.The primary purpose is to evaluate for obstructions, dilatation, or expansion in the upper urinary tract. The procedure may include injecting contrast material into the kidney to obtain serial pressure readings in the kidneys, bladder, and ureters.Radiological supervision and interpretation are typically included in other codes and should not be separately reported with this code (74425 is used for that).

Example 1: A patient presents with suspected ureteral obstruction.A manometric study is performed via an indwelling ureteral catheter to assess the pressure gradients and identify the location and severity of the obstruction., A patient with a nephrostomy tube in place experiences fluctuating urine output. A manometric study is performed to evaluate for any functional obstruction or changes in the collecting system pressure., A patient post-renal surgery has persistent flank pain. A manometric study is conducted to rule out any kinking or obstruction of the nephrostomy tube or the upper urinary tract.

* Pre-procedure diagnosis and clinical indication for the manometric study.* Detailed description of the procedure performed, including the type of catheter used (if applicable), and the location of the pressure measurements.* Documentation of contrast media used (type and amount), if injected.* Results of the pressure measurements (numerical values and interpretation).* Physician's interpretation of the manometric study findings and their correlation with the patient's clinical presentation.