You were denied at Step 4. If you had met a Listing, you would have been approved at Step 3, and then the process stops. See link for the 5 Step Sequential Evaluation Process above.

It's not that your test wasn't performed properly, it just might not have been performed the way SS requires. As one example, it could be something as simple as you had a change of medication within two weeks of spirometry testing, so the test was invalidated. See 3.00 E from link for Listings.

Your case worker would not be asking about upcoming breathing tests if you had enough medical documentation to prove you meet a Listing today. You can ask why you don't already meet a Listing--I'm not sure why they don't volunteer this, but there must be a policy against it. Or, if denied at Reconsideration, you can request a copy of your file to see why they determined that you didn't meet a Listing.