My son is 5yrs old and is allergic to dogs and the presence of some dogs in the house has previously triggered an asthma reaction. We had a dog and had trouble in controlling his asthma when he was 3-4 years old. When we found out about his allergy we moved our dog to the grandparents home. At the same time the allergist switched him to a new inhaled corticosteroid and now is taking Alvesco (80 micrograms every other day). He has been doing very well with no need of any Albuterol in the last year and with no symptom of asthma. We would like to trying to discontinue the inhaled corticosteroid but we heard different opinions. The spirometry FEV1 value usually is in 79-80%. Recently an allergist took a measure and got a very low number (50%). However, I noticed how little effort my 5 year old put in blowing and I told the didn't do it right. At that point the doctor already recommended to double the dose. After insisting many times he took again the test and the number came as in the past (i. e. about 79). I have to admit that considering the huge variability of this test I am not sure how much I can trust a medication prescribed based on this test. This is obviously due to lock of effort that might happen at this age. He really has no symptom not even after 1h of gymnastic or running around playing soccer.
What other test might be performed that is more reliable for this age range and is there anybody in the washington DC area that could do it?
Obviously I do not want to try discontinuing the medication without medical advise but at the same time I also would like to see if it would be possible to slowly discontinue the medication. This is also after reading that many kids that had asthma in this age range they actually grow out of it and the fact that my son has been symptom free for 1 year (first taking for 8 months 80 microgram everyday of Alvesco and then only taking it every other day for the last 4 months)