Welcome!
Diagnosing lupus is not based on any *one* test. There are a host of tests that are done...Combine the results with past medical history, and that is how a doctor can make a diagnosis of lupus. And yes, there are some of us with "conflicting" test results, and not just with the ana.
Furthermore, I can pretty much guarantee you that all of us here with lupus have different test results from the host of tests that have been run on us and some of us may or may not have the same symptoms, organ involvement, and/or level of organ involvement.
Recall, also, that there is a criteria list (a.K.A. Symptom) from the arc that lists 11 items. Of those 11 items, having four can put you in a "likely lupus" category. Only your doctor can diagnose lupus...And there are other autoimmune diseases that are somewhat like lupus...Mctd for one.
I hope this helps...I wish you the best,
ladybrannon