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- Smoking: Stop smoking 1 hour before the test.
- Eating / Drinking: May eat light food.
- Exercise: Do not exercise (jogging, cycling, fast walking aerobics etc.) for 2 hours before test. Wear comfortable cloths.
The following medications are to be withheld prior to the methacholine challenge testing.
| Medication | Examples | Hours prior |
| Long acting bronchodilators | Salmetrol | 48 hours |
| Anticholinergic agents | Atrovent, Spiriva, combivent | 48 hours |
| Nido cromil | Tilade | 48 hours |
| Anti-histamine | Claritine (Loratidine) Zertec (Cetrizine) Allegra (Fexotedine,Fexidine,Telfast) Ebastine (Alastina, Ebastel,Aleva, Ebastrol) | 3 days |
| Cortico steroid. Inhaled and oral | Flovent, pulmicort, Azmacort, advair,symbicort | 24 hours |
| Leukotriene modifiers | Singulair, Accolate | 24 hours |
| Intermediate acting theophylline | 24 hours | |
| Caffeinated beverages like tea, cola, caffeinated chocolates etc | Day of test | |
| Liquid theophylline | 12 hours | |
| Chromolyn sodium | Intal | 8 hours |
| Short acting bronchodilators | Albuterol , ventolin, Xopenex | 8 hours |
If you have any questions or concerns, please call our contact center 800 8 CCAD (800 8 2223)
ABOUT THE TEST
- Your physician has ordered a methacholine challenge test for you. This is a breathing test.The test will consist of series of spirometries , where prior to each one a dose of methacholine is given. This test will take approximately one and half hours. At the end of the test a bronchodilator is given to reverse the symptoms.
How will I know the results of my test?
- Your test results will be sent to the physician who ordered the test. During your follow-up appointment, your physician will discuss with you the results of your test.
