Researchers at the University of Louisville have found that a urine test can tell if children who snore have obstructive sleep apnea (OSA) or not. Apparently, there are different concentrations of stress-related proteins the urine of snoring children with OSA, than in snoring children without OSA. The researchers believe that the test is so simple, it could be performed in the home, like a home pregnancy test. It also might eliminate the need for a costly overnight sleep study to determine if children who snore also have OSA.
This study was published in the December 2009 edition of the American Journal of Respiratory and Critical Care Medicine, but I just saw a blurb about it from the University a few months ago. I thought that perhaps more information had come out about this, but a google search only showed the original findings from 2009. I guess we'll have to wait until more studies have been completed.