Renal Scan or Renogram

A renogram or renal scan is a test that uses a radioactive substance (or tracer) to examine your kidneys and their function.

The scan evaluates the blood flow through the kidneys and measures the amount of time it takes for the tracer to move through the kidneys, collect in the urine and drain into the bladder.

Before Your Procedure

  • Drink at least two 8-ounce glasses of water within 1 hour of the test.
  • No dietary or medication restrictions are required.

During Your Procedure

  • A radioactive substance (or tracer) is injected into a vein in your arm. You will not feel any effects from the injection.
  • The radioactive substance travels through the blood to your kidneys. The radiation you are exposed to with the injected radioactive substance is about the same as a regular X-ray. Your body usually eliminates the tracer within 24 hours.
  • You will be positioned on a table and images will be taken for about 30-45 minutes.
  • Occasionally, a medication called Lasix is also injected to stimulate the urine flow through the kidneys to the bladder.
  • Length of the entire process is approximately 1 hour.

After Your Procedure

  • You can resume your normal activities.
  • Increase your fluid intake unless otherwise directed by your doctor.
  • A radiologist will examine your renogram pictures and your physician will receive a report of the findings and discuss the results with you.

Providing safe, quality patient care is our highest priority. To help ensure quality and safety, we ask that you do not bring young children with you to your appointments, as children are not allowed to accompany you during Imaging procedures. Staff is unable to monitor your child in your absence.

If you have any questions or concerns, please contact your provider.

Back to Imaging Patient Instructions

Dear Friends and Neighbors,

CentraCare care givers have been working around the clock for more than 20 months to care for you, your families and friends during COVID. We are committed to caring for every Minnesotan who needs us, and nothing will prevent us from doing so – even during these never-seen-before times.

The challenge of providing this level of care is that our hospital beds are often full. ERs in all of our hospitals are packed. And our clinical teams are exhausted. Early in the pandemic, our community stepped up in amazing ways to help us. We ask that you again join us in fighting this pandemic together.

How can you help?

  • Please get your COVID vaccines and booster shots. They are proven safe and effective in reducing COVID illness, keeping people out of the hospital, and preventing death.
  • If your situation is not an emergency, please use other care options, including:
  • If this is a medical emergency, call 9-1-1, or visit the ER.

Together, we can do this. Thank you for your support.

Ken Holmen, MD
President and CEO