What it is (overview)

An intra-venous pyelogram (IVP)—also called an intravenous pyelogram—is a type of renal imaging test that uses a special contrast dye injected into a vein and a series of X-ray images to show the kidneys, ureters (the tubes that carry urine to the bladder), and the bladder. You may also hear it described as a “bladder X-ray with dye” or an “IVP urinary tract X-ray.”

After the dye is injected, it travels through the bloodstream to the kidneys, where it is filtered into the urine. As the contrast dye moves through the urinary tract, timed X-rays capture how well urine flows and whether anything is blocking or changing the normal shape of the system. This makes IVP useful for looking at both urinary tract structure and urinary function.

What the results mean in plain language: A normal IVP generally shows two kidneys of typical shape and position, with contrast draining smoothly down both ureters into the bladder. Abnormal results may show delayed drainage (suggesting blockage), filling defects (something occupying space, like a stone or mass), narrowing or widening of parts of the ureter, or unusual kidney/bladder outlines that can indicate a structural abnormality, scarring, or a tumor. Your clinician interprets the findings alongside your symptoms, urine tests, and other imaging.

When & why it's usually done

An IVP is usually ordered when a clinician needs a clear picture of the urinary tract and how urine is moving through it. Today, CT urography and ultrasound are commonly used, but IVP may still be chosen in certain situations based on availability, your medical history, and the specific question your doctor is trying to answer.

Common reasons a doctor may recommend an IVP include:

• Blood in the urine (hematuria), either visible or found on a lab test, to help look for causes such as stones, blockage, or tumors.
• Flank pain or back/side pain suggestive of kidney stones or urinary obstruction.
• Repeated urinary tract infections (UTIs) or complicated UTIs, to evaluate for structural issues that may predispose to infection.
• Suspected urinary blockage (obstruction) from a stone, scarring (stricture), enlarged prostate effects, or external pressure on the ureter.
• Possible kidney or urinary tract tumor or unexplained urinary symptoms when further anatomical detail is needed.
• Congenital or structural abnormalities of the kidneys/ureters (present since birth) or concerns about kidney position/shape.
• Evaluation after urinary tract injury or certain surgeries to assess urinary flow and anatomy.

Because the test uses iodine-based contrast dye and X-ray radiation, your care team may ask about contrast dye allergy, asthma, prior reactions to contrast, and kidney function. Tell your clinician if you are pregnant, have known kidney disease, diabetes, dehydration, or take medicines that affect kidney function—these factors can influence whether an IVP is the safest choice or whether another type of medical imaging is preferred.

Common diseases related to it

• Kidney stones (nephrolithiasis) and ureteral stones (urolithiasis)
• Urinary tract obstruction (e.g., from stones, strictures, or external compression)
• Hydronephrosis (swelling of the kidney from blocked urine flow)
• Recurrent or complicated urinary tract infections (UTIs) / pyelonephritis evaluation
• Ureteral stricture (narrowing) or scarring
• Kidney tumors and urothelial tumors (e.g., renal pelvis or ureter tumors)
• Bladder abnormalities (e.g., large masses, structural changes) seen on contrast-based bladder X-ray images
• Congenital urinary tract abnormalities (e.g., duplicated ureter, abnormal kidney position)
• Polycystic kidney disease (structural changes may be suggested on imaging)

Health goals where it may help

• Finding the cause of blood in the urine to support early diagnosis and treatment planning
• Confirming or ruling out kidney stones and guiding stone management decisions
• Assessing urinary flow to identify blockage and protect long-term kidney function
• Evaluating kidney and urinary tract anatomy before or after selected urology procedures
• Monitoring known urinary tract narrowing (stricture) or recurrent obstruction for changes over time
• Supporting diagnostic work-up for suspected kidney, ureter, or bladder masses using contrast dye renal imaging