Everything's fine! Dr. Spraggins called me today from home (she's on vacation) and said that we should trust the second test results. I still don't know Matt's test results, but the kids are all well within what's considered normal and she said she'd call me to let me know his results. Whatever lead was picked up on the first test was just skin deep, maybe from putting their shoes on before leaving the house... I don't know. I feel sheepish about all of the help we've received, especially now that we know the kids have been fine the whole time, but I think we did the right thing.
This has been a really tough experience and I wouldn't care to repeat it. That aside, I've been so amazed by God's provision for us, through the prayers and fellowship of our friends and family. Thank you to all of you who have fed Matt and labored beside him over the past week. Thank you too for your words of encouragement and your shared experience. I feel like I have a moderate case of emotional whiplash, but all in all we're doing just fine. ;)