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[[File:Antegrade pyelogram of grade III hydronephrosis with obstruction at the ureterovesical junction.jpg|thumb|130px]]
==Preparation==
The procedure can be started in supine position. It can be done in a clean technique (not necessarily sterile) with gloves and radiation protection.
==Procedure with established nephrostomy==
*Take an initial anteroposterior image including the presumed locations of the kidney, ureter and urinary bladder.
*Infuse iodinated contrast, usually at least a volume corresponding to about 15 ml of 240mg/ml iodine. Observe both the imaging and whether the patient develops flank pain. Optionally, note how much contrast has been infused at that point.
*Note the following:
:*Location of the tip of the catheter in the kidney
*Having the patient in a more standing position.
*Having the patient cough.
==Report==
The report may be a chronological description of the procedure, and should include:
*Catheter tip location
*Any visible hydronephrosis or hydroureter
*Even absence of leakage
Optionally also:
*Shape of the most distal part reached by contrast.
*Volume of contrast infused.
*Provocation with standing or coughing.
{|class="wikitable"
| [[File:Antegrade pyelogram of grade III hydronephrosis with obstruction at the ureterovesical junction.jpg|thumb|left]]
The tip of the nephrostomy is located in an inferior calyx.<br>Approximately 50 ml of contrast is infused, whereupon the patient feels flank pain. There is grade III hydronephrosis and hydroureter, with tapering at the ureterovesical junction, and no contrast in the bladder. No leakage.
|}
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