They said it was "borderline" on the regular urine check they have you do every time you go to an appointment? If so, probably what they were referring to was that they always check that for traces of protein spilling in your urine, and you might have been perhaps trace or +1. But those dips can be very inaccurate. The most reliable way to see if you are spilling protein, and to what extent is to collect 24 hours worth and then test it.
Great your doctor is being proactive and looking into it, at the same time if you're unsure about a lab, go ahead and give a call- that's what they get the big bucks for.
I'll keep all crossed that your 24 hour comes back fine. And just so ya have good info, here are the signs and symptoms of pre-eclampsia: http://www.preeclampsia.org/health-info ... d-symptoms
2008-Our Baby Girl, PTL born too early at 30w6d, Fought so hard... Forever Loved & Missed
2010- Lil' Bro, Pre-E at 29 weeks... Induced at 36w6d, Born 37w
2012- Lil' Sis, Super-imposed pre-e at 25 weeks, PTL & GD at 35 weeks, Evicted 36w