Captopril Renogram

This exam shows how well the kidneys are functioning.


  • You will be given a medication called Captopril to lower blood pressure. Your blood pressure will be monitored until it stabilizes.
  • An intravenous (IV) site will be started in one of your arms.
  • You will be placed on a scanning table with a gamma camera located under the table in position to image the kidneys.
  • The nuclear medicine technologist will inject a small amount of radioactive tracer through the IV site and begin the imaging process immediately.
  • Imaging will require you to lie flat on your back completely still for 30 minutes.
  • It is possible that the doctor may order the exam with a diuretic. The diuretic is infused through the IV site.
  • If a diuretic is used, you may need to lie down for an additional 30 minutes.
  • You will follow up with ordering doctor.


  • Please bring a prescription for the procedure if your doctor has given one to you.
  • Bring a list of current medications.
  • Your doctor may want you to stop taking some of your blood pressure medications immediately prior your test date. Please contact the hospital/clinic where you test is scheduled if you have any questions.


  • If you are pregnant or suspect you may be, contact your referring doctor.
  • Tell the technologist if you are planning to travel out of the country.
  • For Macomb patients: Please note that our Nuclear Medicine equipment has a table weight limit of 400 lbs.
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