Meth Challenge test for asthma

[Jess2132000]

I this test a month ago and had all 4 doses. There was not not much drop in my numbers so the Pulmonary Dr asked how long I was off the Advair before the test and I told him 8 hours. Singulair I stopped 24 hours before.He wants to rerun the test again and have me off Advair 2 weeks before the test. What is a normal amount of time to go off Advair for this test? How long does the drug stay in ones system. I guess if I pass this time I do not have asthma and should look into VCD?

[National Jewish]

The normal amount of time to go off Advair

[Ellis7]

See: http://www.rcjournal.com/online_resources/cpgs/mctcpg-update.html
AARC Clinical Practice Guideline
Methacholine Challenge Testing: 2001 Revision & Update

"5.3 Failure to withhold medications may affect the methacholine challenge test. Recommended periods for withholding medications are generally based on their duration of action.1,2 Laboratories may choose to develop a simplified withholding schedule that makes allowances for any of the following used by the patient:

Agent Withholding Time
short-acting inhaled bronchodilators 6-8 hours  

long-acting inhaled bronchodilators (eg: salmeterol, formoterol) 48 hours

corticosteroids, inhaled or oral (may decrease hyperresponsiveness) Duration of effect is unknown but may be prolonged.15,16"
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Your inhaler contains both a long lasting bronchodilator [which requires 48 hr abstinence]; and a corticosteroid, [which requires an unknown prolonged abstinence].

So 2 weeks sounds reasonable, to be sure. This brings up the question of whether your inhaler is benefitting you, ie do you notice any difference in your lung symptoms when off the inhaler?
If its not helping, you probably shouldn't be using it.