Re: what tests are done to determine if a child has lupus?
Dear jdchane, welcome. I'm sorry your daughter is having these problems. I had the same at her age, so I'm glad she's seeing a rheumatologist soon.
For basic lupus info, see the three "sticky posts" (permanent info posts) at the top of the thread list. You'll find criteria for diagnosing lupus, tests, symptoms, helpful books, etc. (Look for the word "sticky".)
The first level of tests include physical exam, bloodwork (standard & specialized), and urinalysis; and these suffice for many people. If nothing so far in her standard bloodwork/symptoms suggests problems with major organs (kidneys, etc.), then I'd just go in with the firm thought she *won't* need more invasive tests. Many people don't, is what I mean.
Re: irregular periods, I was put on BC pills very young, but they made me worse, both periods & overall. However, in that era BC pills were stronger than they are now. After I was dx'ed many years later, my rheumie's assistant remarked how autoimmunes "love" estrogen & thus can flare badly during hormonal shifts. His comment struck home, as my longest flares had been at onset & during perimenopause. So while her rheumie should review everything, you could ask him to comment specifically on BC pills.
I'm only a patient, of course, so please read the above in that light! Anyway, I hope others chip in soon. Post more when you can, OK? Sending your daughter & you warm wishes. Sincerely, Vee