A DTPA scan is a type of renal nuclear medicine test. In this procedure, a small amount of radioactive material (called a radiotracer) is injected into the bloodstream. Special gamma cameras then track how this tracer moves through the kidneys and urinary tract.

This scan provides valuable information about:

• Kidney size and shape
• Kidney blood flow
• Filtration rate (how well your kidneys filter waste)
• Obstructions in the urinary system

Doctors may recommend a DTPA scan for several reasons, including:

• Evaluating kidney function – Measures the split renal function (how each kidney is working individually).
• Detecting urinary blockages – Identifies if there is an obstruction in urine flow due to stones or strictures.
• Monitoring post-surgery recovery – Assesses kidney performance after transplant or corrective surgeries.
• Diagnosing renal artery stenosis – Checks for narrowed arteries that may cause high blood pressure.
• Planning treatment – Provides crucial information before starting therapies for kidney disease.

Step-by-Step Procedure

1. Preparation

• Patients may be asked to drink water before the scan to ensure proper hydration.
• In some cases, mild fasting might be required.

1. Injection of Radiotracer

• A small dose of the DTPA tracer is injected intravenously.
• The tracer is safe, with minimal risk of side effects.

1. Imaging

• The patient lies down under a gamma camera.
• Images are taken at intervals to monitor the movement of the tracer through the kidneys and bladder.

1. Completion

• The scan typically lasts 30–60 minutes.
• Afterward, patients are advised to drink plenty of fluids to flush out the tracer.

A DTPA scan is widely preferred because:

• It provides functional details, unlike regular ultrasound or CT scans that mainly show structure.
• It is non-invasive (only requires an injection).
• It helps doctors plan treatments with precision.
• It offers early detection of kidney problems before they worsen.