A renogram (time-activity curve) shows prompt uptake of the tracer, with activity in the kidney peaking at 3 to 5 minutes after injection and decreasing to less than 50% of peak value by 20 minutes.The technologist should

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The time-activity curve (renogram) from a normal MAG3 study shows prompt uptake of the tracer, with the activity in the kidney peaking at 3 to 5 minutes after injection (when radioactivity is primarily in the parenchyma (functioning tissue)) and decreasing to less than 50% of peak value by 20 minutes.Abnormal curves can result from abnormal renal function, retention of activity in the collecting system, or patient movement.The cause of an abnormal curve usually can be easily determined from visual inspection of the images, with careful attention paid to the fate of activity seen in the peripheral parenchyma (cortex) of the kidney.

A Renogram (Time-Activity Curve) Shows Prompt Uptake of the Tracer