Renal Dynamic Scan (Tc 99m Dtpa) With Gfr Ga

A renal DTPA scan uses a radiolabeled tracer (Tc‑99m DTPA) and a gamma camera to measure kidney perfusion and function, providing split renal function and an estimate of glomerular filtration rate (GFR). It helps assess obstruction, renovascular disease and transplant function through dynamic imaging after intravenous injection. The test is quick, low‑radiation, and generally safe; avoid in pregnancy unless essential.

Tc‑99m DTPA is a radiotracer mainly used in nuclear medicine for renal evaluation. Injected intravenously, it is filtered by the glomeruli, enabling dynamic renal scintigraphy to assess renal perfusion, differential renal function, and glomerular filtration rate (GFR), and to detect urinary tract obstruction. It is also used in certain lung ventilation studies and specialized CSF imaging when indicated.

A renal DTPA (diethylenetriamine pentaacetate) scan typically costs: in India about ₹1,500–₹5,000 privately; in the UK private centres ~£100–£300 (NHS patients usually have it funded); in the US roughly $300–$1,500 depending on facility and insurance. Prices vary by city, hospital type and included radiologist/contrast fees—always confirm exact charges with the imaging centre beforehand.

A normal DTPA renal scan typically shows a total GFR of about 90–120 mL/min/1.73 m². When reported per kidney, normal single‑kidney GFR is roughly 40–60 mL/min, with each kidney contributing about 45–55% of total function. Values lower than these suggest reduced renal function and should be interpreted with clinical context. Your doctor will correlate results with symptoms and blood tests.

A DTPA renal scan is generally not painful. You may feel a brief pinch when the IV is placed and occasional warmth or mild discomfort when the tracer is injected. Lying still or having a full bladder can be uncomfortable, but the scan itself is painless and quick. Significant pain or allergic reactions are rare; tell staff about any concerns.

Kidney failure (end-stage renal disease) is generally defined when the glomerular filtration rate (GFR) falls below 15 mL/min/1.73 m². This corresponds to stage 5 chronic kidney disease. At this level, kidneys cannot adequately clear waste and patients often require dialysis or transplantation, especially when symptoms, complications, or declining function occur (dialysis may begin around GFR 10–15 depending on clinical factors).