I would go further
We havent a clue what the 62% refers to and OP probably doesnt either. We dont know what equipment was used, nor its providence nor who carried out the test nor their training. To carry out a medical test during an interview is bizarre and no doctor would support this sort of a screening test so it is possible it was a non medical person with some unknown equipment being daft.
If you have no medical history, no asthma, no shortage of breath I would ignore the result. It was not a properly executed medical test any more than playing with a stethoscope in a child's nurses set. Your GP would I am sure do a simple peak flow test if you are worried, and if that is normal I for one would consider the previous test a false positive.
Last edited by Radgirl; 10th Sep 2015 at 20:35.
Reason: further advice