DTPA Renal Dynamic Scan (Renogram) at Nepal Center of Nuclear Medicine

What is a 99mTc-DTPA scan? 

(Non-invasive evaluation of individual kidney perfusion, function, and urinary drainage/obstruction).

Why is a DTPA Renal Scan Performed?

• • Evaluating suspected ureteric obstruction or pelviureteric junction (PUJ) obstruction.

  • Assessing split renal function (differential GFR between left and right kidneys) prior to surgery or kidney donation.

  • Evaluating post-operative kidney transplant function.

  • Diuretic challenge (Lasix/Furosemide DTPA renogram) to differentiate between mechanical obstruction vs. non-obstructive hydronephrosis.

How to Prepare for Your DTPA Renal Scan? (Patient Preparation Guidelines - Hydration & Fasting)

Hydration: Drink 500–1000 mL of plain water 30–60 minutes before the scan (unless strictly fluid-restricted by a nephrologist).

Dietary Needs: Light meal permitted; fasting is generally not required unless specifically advised.

Medications: Bring a list of current prescriptions (especially blood pressure medications or diuretics).

Previous Reports: Bring relevant ultrasound reports, serum creatinine/blood urea reports, and previous CT/MRI scans.

Special Considerations for Children: Pediatric feeding and hydration instructions, plus guidance on keeping young patients calm.

What to Expect During the Scan? (Procedure Steps & Scan Duration)
Step 1: Registration & Pre-Scan Hydration: Verification of kidney lab values (Serum creatinine) and final water intake.

Step 2: Radiotracer Administration: Safe, low-dose injection of Tc-99m DTPA into a vein.

Step 3: Gamma Camera Imaging: Dynamic imaging begins immediately while lying flat on the scanner bed (duration: ~30 to 45 minutes). In some cases of obstruction, delayed imaging is also done for a minute after 3 hours of injection of DTPA.

Step 4: Diuretic Injection (If Prescribed): Administration of IV Furosemide to assess urinary clearance curves.

Step 5: Completion & Discharge: No recovery downtime; patients can resume normal daily activities immediately.

Frequently Asked Questions (FAQ)

Q1: What is the difference between a DTPA scan and a routine Kidney Ultrasound?

An ultrasound provides anatomical pictures showing the physical size, shape, and visible swelling (hydronephrosis) of the kidneys. In contrast, a DTPA renal scan is a functional study that measures blood flow, filtration rate (GFR), and whether urine is actively draining or mechanically blocked in each kidney independently.

Q2: Is the radiation from a DTPA scan safe, especially for children?

Yes. The radiotracer (Tc-99m DTPA) uses a minimal diagnostic dose tailored to body weight, resulting in low radiation exposure comparable to standard X-ray or CT procedures. The tracer naturally filters through the kidneys and leaves the body quickly through urination.

Q3: Do I need to fast before a DTPA renal scan?

No, fasting is usually not necessary. In fact, good hydration is essential. We recommend drinking 2 to 3 glasses of water before arriving, unless your treating nephrologist has placed you on strict fluid restriction.

Q4: How long does the entire DTPA procedure take?

The imaging session on the gamma camera typically takes about 30 to 45 minutes. We advise allowing approximately to arrive 30 to 45 minutes before to cover registration and pre-scan hydration. In case of obstruction, 3-hour delayed imaging for 1 minute is also performed - Such cases need extra 2 and half hours for the delayed imaging. For renal transplant donor evaluation, delayed imaging is not required.

Q5: Can I drive or resume normal work after the scan?

Yes. The scan does not use sedatives, cause drowsiness, or impair motor skills. You can drive, return to work, and eat your regular meals immediately after leaving the clinic. Drinking extra water throughout the rest of the day helps clear the remaining tracer.

Q6: How do I book an appointment at Nepal Center of Nuclear Medicine?

You can schedule your scan by calling our Lalitpur reception desk directly or contacting us via WhatsApp. Prior appointments ensure radiotracer preparation is synchronized with your arrival time.