A retrograde pyelogram is a specialized, live X-ray scan (fluoroscopy) used to check the ureters and kidneys. The ureters are the thin tubes that drain urine from each kidney down into the bladder. If standard scans like CT or ultrasound cannot show why your urine flow is blocked, this test provides a detailed view of the urinary tract.
The test is called "retrograde" because the contrast dye is injected in a direction opposite to the natural flow of urine—flowing up from the bladder toward the kidneys.
Common Indications for a Retrograde Pyelogram
- Investigating a blockage in the ureters when other scans are inconclusive.
- Locating stones, tumors, or strictures in the ureters.
- Checking for urinary tract leaks or injuries after pelvic surgery or trauma.
- Assisting in the placement of a ureteral stent (a tube that keeps the ureter open).
- Evaluating kidney function in patients who cannot have contrast dye injected into their veins.
What exactly does a retrograde pyelogram show?
The scan shows the inner lining and shape of your ureters and the collecting system (pelvis) of your kidneys. It clearly highlights the exact site and cause of any obstruction or narrowing.
How should I prepare for a retrograde pyelogram?
You must fast (no food or drinks) for at least 6 hours before the procedure. This is because the test is usually performed in an operating room under sedation or general anesthesia to ensure your comfort. You must arrange for a driver to take you home.
Do I need to stop taking medication?
If you are taking blood-thinning medications (such as aspirin or anticoagulants), you must discuss stopping them with your referring doctor several days before the procedure to prevent bleeding risks.
What happens when I arrive for my scan?
You will change into a hospital gown. An intravenous (IV) line will be placed in your arm to deliver sedative medications. You will lie on your back on the X-ray table with your legs placed in supports, similar to a pelvic exam.
How is the procedure performed?
The doctor will first insert a lighted telescope (cystoscope) through your urethra into your bladder. Through the cystoscope, they will locate the tiny opening where the ureter connects to the bladder. They will insert a thin, soft tube (catheter) into the ureter and slowly inject the contrast dye. The radiographer will take live X-ray images as the dye flows upward. If needed, the doctor will insert a stent during the same session.
How long does a retrograde pyelogram take?
The entire procedure takes about 30 to 45 minutes. Including preparation and recovery from sedation, you will spend about 2 to 3 hours at the clinic.
Is there any discomfort?
Because you will receive sedation or general anesthesia, you will not feel any pain during the procedure. Afterward, you may feel a mild cramping sensation in your bladder or back and a burning feeling when you urinate for a day or two.
Are there risks?
Yes, but they are generally minor. The main risks include a temporary urinary tract infection, mild bleeding, or irritation of the bladder or ureter walls. The scan uses a low dose of radiation, similar to a few months of natural background radiation.
Can children have this scan?
Yes. Children with congenital urinary blockages can have this scan safely. It is always performed under general anesthesia.
Can I have this scan if I am pregnant?
Pregnancy Precaution
Tell your doctor or radiographer if you are pregnant or think you might be. Because this scan uses X-rays directly over the pelvis, it is only performed during pregnancy when there is a severe urinary obstruction that cannot be managed with safer alternatives.
When will I get my results?
The doctor will review the images in real-time. The results and any interventions (like stent placement) will be discussed with you before you leave. A formal report will be sent to your referring doctor within 24 hours.
What if the scan finds something?
If the scan identifies a stone or tumor, the doctor can often treat the issue during the same procedure (e.g., placing a stent or removing a stone) or recommend a targeted surgical plan.
Conclusion
A retrograde pyelogram is a highly effective, specialized procedure for identifying and treating urinary tract blockages. Remember to fast strictly for 6 hours beforehand, and drink plenty of water after the test to help flush the contrast dye out of your system.