Many males clients have been seeing elevated SHBG with no explanation why. Over the past several months, I have been running GPL TOX from Great Plains Laboratories finding elevated levels of BPA in urine with higher correlation of males with elevated SHBG. This was also found in correlation with my own labs.
https://www.ncbi.nlm.nih.gov/pubmed/25213476
https://www.ncbi.nlm.nih.gov/pubmed/25213476