DTPA Scan (Diethylenetriamine Pentaacetic Acid Scan) – Details & Precautions

A DTPA scan, also known as a Renal DTPA Scan, is a nuclear medicine test used to evaluate kidney function, blood flow, and urine drainage. It is commonly used to diagnose kidney obstruction, renal artery stenosis, and overall kidney function.

---

Details of a DTPA Scan

Purpose

• Assesses kidney function and blood flow.
• Detects kidney obstructions (e.g., due to kidney stones or tumors).
• Evaluates renal artery stenosis (narrowing of kidney arteries).
• Monitors kidney transplants to check for rejection.
• Determines the differential function of each kidney.

Procedure

1. Radioactive Tracer Injection

   • A small amount of Technetium-99m DTPA is injected into a vein.
   • The tracer is filtered by the kidneys and excreted in the urine.

2. Imaging Process

   • You will lie still under a gamma camera.
   • The camera takes images at regular intervals for 30–45 minutes to track kidney function and urine drainage.
   • In some cases, a diuretic (e.g., furosemide/Lasix) may be given to assess urine flow and detect blockages.

3. Completion

   • The scan results show how well each kidney is functioning and whether there are any obstructions.

---

Precautions for a DTPA Scan

Before the Test

✅ Hydration:

• Drink plenty of water before the test (unless instructed otherwise).

✅ Fasting:

• Some centers may ask for 2–4 hours of fasting before the scan.

✅ Medication Restrictions:

• Inform your doctor if you take medications for high blood pressure, diuretics, or kidney disease.
• Some medications, like ACE inhibitors (e.g., enalapril, captopril), may need to be adjusted before the scan.

✅ Recent Contrast Studies:

• If you recently had a CT scan with contrast, inform your doctor, as it may interfere with results.

✅ Pregnancy/Breastfeeding:

• Inform your doctor if you are pregnant or breastfeeding, as the radioactive tracer may affect the baby.

During the Test

• Lie still to avoid blurry images.
• Inform the technician if you feel nausea, dizziness, or discomfort.
• If a diuretic is given, you may feel an urgent need to urinate.

After the Test

✅ Drink plenty of water to flush out the radioactive tracer.
✅ Resume normal activities and diet unless otherwise instructed.
✅ Avoid close contact with infants or pregnant women for a few hours if advised.