Methacholine Challenge Testing
The purpose of a methacholine challenge test is to determine the amount of airway irritability of a patient.
The test usually takes about an hour.
Plan on arriving 15 minutes before your appointment for check-in. You will check in at the patient registration desk in the main lobby of the hospital.
How Do I Schedule Testing?
To schedule a test you must have a test ordered by a physician. To make an appointment call (509) 946-4611 ext 2119.
Who Performs The Testing
A Respiratory Therapist specially trained in pulmonary function testing will perform your test. A Pulmonologist will interpret the results and provide your physician with a report.
Indications For PFT Testing
Including but not limited to:
- The need to exclude a diagnosis of airway hyperactivity.
- The need to evaluate occupational asthma.
- The need to assess the severity of hyper responsiveness.
- The need to assess response to therapeutic interventions
When is a test contraindicated?
Including but not limited to:
- Heart attack or stroke within 3 months.
- Known aortic or cerebral aneurysm.
- Uncontrolled hypertension.
- Inability to perform spirometry of an acceptable quality.
- Upper or lower respiratory tract infection with previous six weeks.
- Current use of cholinesterase-inhibitor medication.
How Do I Prepare?
- Plan on arriving 15 minutes before your appointment for check-in. You will check in at the patient registration desk in the main lobby of the hospital.
- Do not participate in significant exercise or have exposure to extreme heat or cold for 2 hours prior to testing.
- If you are having respiratory symptoms the day of the test, please call 942-2119 and notify the respiratory therapist before arriving for your test.
- Do not eat or drink anything with caffeine (coffee, cola, tea, chocolate) for at least 12 hours prior to testing.
- Do not smoke for at least 6 hours prior to testing.
72 hours prior to test:
Stop all anti-histamines
48 hours prior to test:
Stop long-acting bronchodilators (Theophylline, Theodur, Serevent, Advair, Foradil)
Stop anticholinergics (Combivent, Atrovent, Duoneb, Tilade, Intal)
24 hours prior to test:
Stop Leikotriene modifiers (Singulair, Accolate, Syflo)
8 hours prior to test:
Stop all bronchodilators (Proventil, maxair, Ventolin, Albuterol, Xopenex, Accuneb.
If you are taking a beta blocker drug (eg, atenolol or propranolol) please discuss this with your physician before scheduling your test as this medication may need to be held before testing.
What do I do during testing?
You will be asked to inhale a mist that contains different concentrations of methacholine. The mist is produced by a device called a nebulizer and inhaled through a mouthpiece. Before the test begins, and after each period of inhalation, you will be asked to blow forcefully into a spirometer.
How do I get my test results?
You may receive a copy of your test results by contacting the Health Information Department at 946-4611 ext 2017.