Yes, it is possible to have Lupus without positive blood tests. There are NO tests that say "this is lupus positively and cannot be anything else". Lupus is defined as having 4 of 11 symptoms, as indicated by following the '4 of 11' link in my signature.
It does sound like either you and/or your daughter could be suffering from some auto-immune related illness -- but there are so many of them! And they are "mix-n-match" when it comes to symptoms. Many of us here have found that the actual diagnosis is less important than treatment -- these are not really "curable" illnesses as much as they are manageable - and there are lots of ways to treat and minimize the symptoms.
Mixed connective tissue disease, MCTD, as we like to call it, means about
the same - some sort of auto-immune mixture, but not sure exactly what the mix is, so this is the official diagnosis. As long as you feel your symptoms are getting adequate treatment, stay the course -- but if not, maybe check in with a lupus-aware rheumy. These docs can be found by locating your local chapter of the Lupus Org, then asking which local rheumys are working with the chapter -- these are the docs who are most qualified to diagnose lupus.
Hope this helps, and that you are both feeling better soon,
Lynnwood, Co-Moderator: Lupus Forum
SLE(’00), Sjogren's Syndrome, Raynaud's Syndrome, Seasonal Affective Disorder, Depression, Herpes Simplex 1
15 6mg), Piroxicam, Xanax, Trazodone, Boniva, Wellbutrin, Valtrex
Links: DIAGNOSING LUPUS (4 of 11), LUPUS INFORMATION, LUPUS RESOURCES, Donate to HealingWell, Drug Interactions
"Life is far too important to be taken seriously." –Oscar Wilde, 1982