Have you researched Fifth Disease with the positive the Parvovirus 19....?
In regards to your question, yes you can have negative tests and still have Lupus..
Tests, labwork are just a small piece of the puzzle. The help to rule out other diseases. Has she met the other ACR criteria for diagnose? Four of eleven is required...
Refer here for the criteria...http://www.lupus.org/webmodules/weba...id=75&zoneid=9
And this Sticky....http://forum.wehavelupus.com/showthread.php?t=4665
Hope this helps...
Wishing your daughter wellness..
I have Lupus. So *^#@! what.