Stopping Meds before PFT

Hi all,

Quick question, I take an ICS Bechlomethasone (Qvar in US) for my mild asthma and mild chronic bronchitis. I'm not taking anything else due to a few meds not suiting me, hence the review.

I've gone without it for years so stopping abruptly will result in some symptoms returning for a few days but it won't be life altering.

I want to get a true baseline at my next PFT as its the first I've had since '04. The standard letter says I can continue to take ICS but stop LABA etc.

I plan to stop the ICS also to get to this true baseline, how long should I be off it to ensure it won't influence the test?

Thanks again,

Con.