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Blood tests reveal that SLE patients are more likely to have been exposed to certain viruses than the general population, sometimes years before diagnosis. Among the viruses that provoke the most interest are the Epstein-Barr virus (the cause of mononucleosis), cytomegalovirus, and parvovirus-B1. These viruses are very common, but would serve as triggering agents in people with genetically susceptible immune systems.
Lupus is a very difficult disease to diagnose because it affects each of us differently. Also, there is no one definitve test that says "Yes . this is definately Lupus". Doctors have to run a series of tests which will vary depending upon the symptoms that you are presenting.
Some of us have waited over a year, while being tested, for a diagnosis.
There are several posts on this forum that talk about and explain the tests for lupus. Perhaps you will be able to find some answers to your questions in those posts!
Best Of Luck