What are the causes of a positive ANA test result?

Many. ANA can be positive in many diseases and in many apparently healthy people. By itself , it does not mean much other than pointing to a higher but not certain risk for an individual to develop an autoimmune disease.

Related Questions

Would a negative ANA rule out lymphoma? Does lymphoma cause a positive ANA test result?

It does not. At your age, if you have lymphoma it's probably Hodgkin's. ANA really has nothing to do with malignant lymphoma. If you're worried about big lymph nodest, trust me -- lymphoma nodes are obviously very abnormal. Best wishes, and I hope you'll always stay actively involved with your health. Read more...

I've had a strong positive ANA test result. All the various antibody tests are negative. Symptoms are, joinfpain fatigue hive episode, fevers, etc.?

Close but not there. Doesn't sound like you have a rheumatologic illness yet. You may develop one. If your ANA was positive at greater than 1:640 you should be monitored every six months for progression of symptoms if not you should be monitored less often. Read more...
Agree with Dr. F. For information on diagnostic criteria for rheumatoid arthritis, you may visit this site:
https://www.hopkinsarthritis.org/physician-corner/education/arthritis-education-diagnostic-guidelines/ Read more...

I had once positive ANA and asma test result, after one month I repeated the tests at the same lab and it gave negativ in both, what shd I do now?

Laboratory problem. The efficiency of specific testing can be affected by a variety of problems. It may be dependent on the laboratory testing material, the efficiency of the testing, machine error, human error etc. The testing results needs to be filtered by your physician. Your doctor can also contact the lab to have them explain this disagreement. Read more...