What is an antegrade pyelogram?
An antegrade pyelogram is an imaging test to find a blockage in the upper urinary
tract. Your urinary tract includes the kidneys, ureters, and bladder. The ureters
are the narrow tubes that carry urine from the kidneys to the bladder.
X-rays use a small amount of radiation to create images of your bones and internal
organs. An antegrade pyelogram is one type of X-ray.
Fluoroscopy may also be used during this test. It's like an X-ray "movie." Or the
radiologist may use ultrasound to guide the placement of the needle. These tests can
help the radiologist locate the kidneys and ureters.
During the test, the radiologist injects a contrast dye through a needle that is placed
through the flank area of your back. The area will be cleaned with sterile material
and you will be given a local anesthetic. The radiologist uses X-ray images to watch
the contrast dye as it moves from the kidney into the ureter and then to the bladder.
Why might I need an antegrade pyelogram?
You may need an antegrade pyelogram if your history strongly suggests you have a blockage
in your urinary tract and other imaging tests did not give your primary healthcare
provider enough information to make a diagnosis. You may have had a retrograde pyelogram,
a similar test that looks at the kidneys and ureters. Or you may have had an intravenous
pyelogram. In that test, the contrast dye was injected into a vein instead of into
your kidney or ureter.
The antegrade pyelogram can find a blockage in the urinary tract caused by:
The radiologist can find the blockage by looking at the X-ray images. The contrast
dye will not be able to move or may be delayed through the kidney if you have a blockage.
You may also need this test to assess the kidneys or ureters before or after surgery.
If you have a blockage, the surgeon may use a special tube (ureteral stent) to pass
the urine around the blockage or place a kidney tube (nephrostomy catheter) to relieve
Your healthcare provider may have other reasons to advise an antegrade pyelogram.
What are the risks of an antegrade pyelogram?
You may want to ask your healthcare provider about the amount of radiation used during
the test. Also ask about the risks as they apply to you.
Consider writing down all X-rays you get, including past scans and X-rays for other
health reasons. Show this list to your provider. The risks of radiation exposure may
be tied to the number of X-rays you have and the X-ray treatments you have over time.
Tell your healthcare provider if you:
Are pregnant or think you may be pregnant. Radiation exposure during pregnancy may
lead to birth defects.
Are allergic to or sensitive to any medicines, contrast dye, or iodine. Because contrast
dye is used, there is a risk for allergic reaction to the dye.
Have kidney failure or other kidney problems. In some cases, the contrast dye can
cause kidney failure. You are at higher risk for this if you take certain diabetes
Possible complications of antegrade pyelogram include:
Formation of a urine-filled cyst (urinoma)
Blood clots in the nephrostomy tube if used, or clots in the bladder
You may not be able to have this test if you have a blood-clotting disorder.
You may have other risks depending on your specific health condition. Talk with your
provider about any concerns you have before the test.
How do I get ready for an antegrade pyelogram?
Your healthcare provider will explain the test to you. Ask them any questions you
have about the test.
You may be asked to sign a consent form that gives permission to do the test. Read
the form carefully and ask questions if anything is not clear.
Follow any directions you are given for not eating or drinking before the test. It
might be several hours or overnight.
Tell your provider if you are pregnant or think you may be pregnant.
Tell your provider if you are allergic to contrast dye or iodine.
Tell your provider if you are sensitive to or are allergic to any medicines, latex,
tape, or anesthetic drugs (local and general).
Tell your provider about all medicines you are taking. This includes prescriptions,
over-the-counter medicines, vitamins, and herbal supplements.
Tell your provider if you have had a bleeding disorder. Also tell your provider if
you are taking blood-thinning medicine (anticoagulant), aspirin, or other medicines
that affect blood clotting. You may need to stop these medicines before the test.
You may get medicine to help you relax (sedative) during the test. You will need to
have someone drive you home afterward.
You may be given antibiotics before and after the test.
Follow any other instructions your provider gives you to get ready.
What happens during an antegrade pyelogram?
You may have an antegrade pyelogram as an outpatient or as part of your stay in a
hospital. The way the test is done may vary depending on your condition and your healthcare
Generally, an antegrade pyelogram follows this process:
You will be asked to remove any jewelry or other objects that may get in the way of
You will be asked to remove clothing and given a gown to wear.
An IV (intravenous) line will be inserted into your arm or hand. Your blood pressure,
pulse, and breathing will be watched.
You will be asked to lie face down on the X-ray table. The radiology nurse or radiology
technologist will wipe an area of skin on your lower back with iodine. This will sterilize
the area. Sterile drapes will be placed around it.
The radiologist will inject a local anesthetic to numb the area. Using ultrasound
or fluoroscopy, the radiologist will move the needle into the renal pelvis and inject
the contrast dye. You may feel mild discomfort during the injection of the local anesthetic.
You may also have a brief feeling of warmth from the contrast dye.
The radiologist will take a series of X-rays as the dye moves through the ureters.
Once the needle has been inserted, the radiologist may put a thin wire through the
needle. This will let them put in a thin tube (catheter), a nephrostomy tube, or other
devices that are needed.
The radiologist will remove the needle if you don't need a nephrostomy tube.
They will put a sterile bandage or dressing on the site.
What happens after an antegrade pyelogram?
After the test, you will be taken to the recovery room. Medical staff will watch your
blood pressure, pulse, and breathing. Once you are alert, you will be taken to your
hospital room or sent home.
Your urine will be watched closely to see how much of it you are making and if you
have any blood in it. Your urine may be red from even a small amount of blood. This
is considered normal. You may be told to keeping looking at your urine output for
a day or so once you are home.
You may have pain when you urinate. Take a pain reliever for soreness as advised by
your healthcare provider. Take only the medicines your provider tells you to. Aspirin
or certain other pain medicines may raise the risk of bleeding.
Call your healthcare provider right away if any of these happen:
Fever or chills
Redness, swelling, or bleeding or other drainage from the insertion site
Pain around the insertion site gets worse
You have more blood in your urine
Your healthcare provider may give you other instructions, depending on your situation.
Before you agree to the test or the procedure, make sure you know:
The name of the test or procedure
The reason you are having the test or procedure
What results to expect and what they mean
The risks and benefits of the test or procedure
What the possible side effects or complications are
When and where you are to have the test or procedure
Who will do the test or procedure and what that person’s qualifications are
What would happen if you did not have the test or procedure
Any alternative tests or procedures to think about
When and how you will get the results
Who to call after the test or procedure if you have questions or problems
How much you will have to pay for the test or procedure