Some tests may need you:

• Not to smoke for 24 hours before the test
• To wear loose-fitting, comfortable clothing
• Not to eat anything heavy for two hours before the test
• Not to drink alcohol for at least four hours before the test.

And they may ask you not to take these medicines:

• Salbutamol (ventolin, salamol) or bricanyl inhaler for at least six hours before the test
• Atrovent (ipratropium), duovent or combivent for at least six hours before the test
• Symbicort, serevent, seretide and theophylline (aminophylline) for 12 hours before the test
• Tiotropium for 24 hours before the test.
• If you do have to take one of these medicines – then make a note of when you take it, and let the tester know.