What can influence a mildly positive ana .. besides lupus?

i had hives... went n got blood work ... now they say I have a mildly positive lupus test results... BUT she said that my blood count was fine liver and kidney and thyroid was fine blood work fine...Im going for a second opionion. I have noooooo symptoms .. only thing i have is hives. none of tht other stuff. so im wondering wt else could have effected this test. n why the hell would he think to test for lupas from HIVES.