After a short case history and a survey of current medication, the examination is carried out in a supine position. After a small quantity of a radioactive substance has been injected via an intravenous line, the imaging of the kidneys is carried out in a lying position. This process takes around 25 minutes.
If there is suspicion of a renal obstruction, it may be necessary for you to be administered a diuretic via the intravenous line after 15 minutes. If hypertension is being investigated, it may be necessary for you to be administered an antihypertensive (an ACE inhibitor) 30 minutes before the examination.