Final answer:
MAG3 is the best radiopharmaceutical to use for renal scanning if a determination of effective renal plasma flow is also desired.
Step-by-step explanation:
The best radiopharmaceutical to use for renal scanning if a determination of effective renal plasma flow is also desired is MAG3 (Mercaptoacetyltriglycine).
MAG3 is commonly used for dynamic renal imaging and provides important information about the functioning of the kidneys. It is excreted by the kidneys and gives a visual representation of the renal blood flow and the function of each kidney. MAG3 has a high extraction fraction, which means it is removed from the blood and delivered to the kidneys effectively.
Other radiopharmaceuticals like Tc99 GH, DMSA, and DTPA are also used for renal scanning, but they do not provide the same level of information about the renal plasma flow as MAG3.