Methacholine test

Methacholine test

Location and Contact

Phone (patient scheduling office): 905-472-7020
When you arrive at Markham site: Register at the registration desk in the main lobby. The registration desk clerk will direct you to your test or procedure.

A methacholine test is a completely safe breathing test that is used to determine the extent of your airway reactivity. This test is ordered if you have completed a normal pulmonary function test, yet require further diagnosis to investigate symptoms.

Patients must be at least eight years of age to have this test done.

To have a methacholine test, your doctor needs to fill out a requisition form. Download methacholine test requisition form.

Learn more about making an appointment and coming to the Markham site.

Find out more about this procedure in our Methacholine test brochure.

The methacholine test will be performed by a registered respiratory therapist (RRT). The RRT will guide and coach you through this test.

Before your methacholine test

Your physician will give you detailed instructions and tell you what asthma medications to stop taking prior to the test.

During your methacholine test

During your test, the RRT will guide and coach you through a series of breathing tests. You will be in a glass booth that has a door. You will have a nose clip and mouthpiece. You will be asked to take deep breaths in and out while performing the tests.

Please review the attached patient instructions for more details about the test and medications, prior to your visit.

Frequently asked questions about the methacholine test

  • Do I have to sit in a booth?
    Yes. However, the door of the booth will stay open except for one portion of one breathing test. The door is only closed for a total of  one  minute.
  • Can I do the test if I am in a wheelchair?
    Yes. We can accommodate patients who are in a wheelchair.