What imaging method utilizes Tc mertiatide (MAG-3) for functional assessment?

• A. X-ray
• B. CT scan
• C. Renal scanning
• D. MRI

Answer: (C)

Tc mertiatide, also known as MAG-3 (Mercaptoacetyltriglycine), is specifically used in renal scanning, which is a type of nuclear medicine imaging. This technique assesses renal function, blood flow, and the kidney’s ability to excrete a radiotracer. MAG-3 is particularly useful in evaluating conditions such as renal artery stenosis, kidney transplant function, and to determine differential renal function.

During a renal scan, MAG-3 is injected into the bloodstream, and its distribution and clearance from the kidneys is measured using a gamma camera. This functional assessment is crucial because it provides valuable information about renal perfusion and tubular function that other imaging modalities, like X-rays, CT scans, or MRIs, do not offer in the same capacity. Thus, the utilization of MAG-3 in renal scanning is essential for accurate evaluation of kidney health and function.