Can i have asthma even if i have normal oxygen levels and a normal chest xray?

Yes: Asthma most often will not have abnormal chest xray findings and unless very severe episode oxygen levels will be ok as well.

Yes...: That is actually typically the case in asthma patients; they have normal physical exam, normal oxygen levels and a normal chest x-ray when they are not having an asthma exacerbation. During an asthma exacerbation, these findings may change but between exacerbations, all these findings are usually normal.