Back to Top SeHCAT Scan Tauroselcholic (75-selenium) acid  - The Ottawa Hospital Website scanner for suspicious and malicious URLs


Your doctor has requested a Tauroselcholic Acid (SeHCAT) scan. This booklet will answer some of the questions you may have. 

What is a SeHCAT scan? 

A SeHCAT Scan is a simple and painless way of assessing for bile acid malabsorption using a radioactive capsule and a camera. 

What is involved? 

You will be given two appointments for your test, seven days apart: 

On the first visit (~30 min), a technologist will explain the entire procedure to you and then give you the opportunity to ask any questions. You will then be given a radioactive capsule to swallow. There are no known side effects from this capsule. Immediately following the ingestion of this capsule, you will be asked to stand in front of a special detector, called a gamma camera, to take pictures from the front and back. You will be asked to remove all external metal objects from your body, including your jewelry. You may also be asked to change into a hospital gown. The imaging time is five minutes for each picture. 

On the second visit (7 days later, ~15 min), You will once again be asked to stand in front of a gamma camera to take pictures from the front and back. You will be asked to remove all external metal objects from your body, including your jewelry. You may also be asked to change into a hospital gown. The imaging time is five minutes for each picture. You will not be required to swallow another capsule prior to the images for this appointment.  The special camera will measure the activity remaining in your body from the capsule you consumed on day one. 

Do I need to prepare for the scan? 

  • Bring your health card. 
  • You will be required to fast for at least 4 hours before your appointment on day one.   
  • There is no need to fast on day 7. 
  • Certain medications interfere with the results of this test and need to be stopped prior to the exam. Please give a complete list of your medications to the booking clerk and they will advise you which medications need to be stopped. You must always consult your physician before stopping any medication. Please bring a complete list of your current medications. 
  • We would like you to dress in clothing that does not have any metal. Please refrain from wearing any jewelry. Please leave all valuables at home. 
  • Please notify our booking office at the time of scheduling your appointment if you have any concerns regarding claustrophobia, lying still, require a mechanical lift for transfer to the imaging bed, have a language barrier or any other special needs, so that appropriate arrangements can be made ahead to provide you with the best possible care. 

Will it hurt? 

This test is completely painless. 

Is the radiation dangerous? 

The injection contains a small amount of radioactive tracer which emits gamma rays (these are similar to X-rays). The radiation dose is very low. The results of your scan will give your doctor useful information about your condition and will help them plan your treatment. The benefits of having the scan far outweigh any potential risk from the small radiation dose.  

Do I need to do anything after the scan? 

No special precautions are needed after the scan. If you are travelling across any borders in the seven days after your scan, please ask us for further advice. Border crossings and airports have very sensitive radiation detectors which may pick up tiny amounts of radioactivity remaining after your scan. We will give you a letter that you can show to customs officials at border crossings or airports. 

Is there anything I should tell the staff before the injection? 

Please tell us if you are pregnant or breastfeeding. 

What about breastfeeding? 

Breastfeeding will need to be interrupted for at least 3 weeks. It is vital that you ensure that we are aware if you are pregnant and/or breastfeeding. 

How will I get the results of my scan? 

A specially trained doctor will examine the pictures. This is normally done soon after the end of the scan. A report is then sent to the doctor who asked us to do the scan. Your doctor will normally receive the report within one week. You will also have access to the report on MyChart as soon as it is released. 

If you have questions about the scan results or report, please contact your doctor directly. They are best able to interpret the report for you. 

Will this test cost me money? 

No. This test is paid for by the healthcare system. The test costs several hundred dollars, so please notify the department at 613-761-4831 if you cannot make your appointment. 

What should I do if I cannot make my appointment? 

If you cannot make you appointment, it is important that you notify the department at 613-761-4831 as soon as possible. Failure to make your appointment results in wasting of expensive materials that are ordered especially for your appointment and also reduces availability to other patients. Missed appointments may also result in delays of your treatments. 

Directions and Parking 

Civic Campus  1053 Carling Avenue – 1st Floor Tel.: 613-761-4831, option 8 Hours: Mon. – Fri., 8:00 a.m. – 4:00 p.m. Directions: From within the Civic Campus, take the “C” elevators to the 1st Floor and follow the signs to Nuclear Medicine. Patients may also ask for directions at the patient information desk. General Campus  501 Smyth Road Main level Tel.: 613-761-4831, option 8 Hours: Mon. – Fri., 7:00 a.m. – 4:00 p.m. Directions: From the main entrance, follow the signs on the main level (located at the public elevators). Patients may also ask for directions at the patient Information desk. 
Park in either parking lot off Carling Avenue (P7) or in the multistory parking garage (P1).  Park in the parking garage which is located beside the main entrance just off Smyth Road.  

Parking instructions 

  • All parking lots are automated  
  • Take the parking ticket with you inside.  
  • When you have completed your appointment, you can pay by cash or credit card at one of our pay stations, or you can pay by credit card with express exit at the parking lot exit gates (the grace period after payment to leave facility is 20 minutes). 
  • Payment methods: 
    • Pay stations: Cash or credit card (Visa, MasterCard or American Express). 
  • Maximum parking fee is $13.00 

Visit The Ottawa Hospital’s website for additional directions and parking instructions and maps.

Last updated on: April 25th, 2022