IV bolus of 1ml dye is injected. If no untoward reactions are noticed remaining dye is injected. Thereafter plates are shot at 1,5,10,15 and 20 minutes. For better filling of pelvic-calyceal system after 5 or 10 mintues film, abdominal compression may be applied for 10 to 15 minutes and then released. For uretric filling at 15-20 minutes oblique films are taken.
Lower plate is taken with full bladder and after voiding urine.
Delayed films upto 24 hrs are taken to visualise excretion in case of poorly functioning kidney. Complications Local pain due to venous spasm, urticaria, flushing, vomitting, generalised warmth. Severe reaction - Anaphylaxis and death. It is done in suspected renal artery stenosis. In this the contrast medium is given in 200 to 500 ml of glucose drip fashion.