Thank you for your reply and the helpful information. My Lawyer says he wants a support letter from the prescribing doctor or pharmacist whom I get my Metformin from. But they won't due to some privacy problem. So that's why I've come to you. I think my Lawyer basically wants someone who knows about this situation to just say that they know Metformin can give false positives. He won't accept the webpages, not even the one from Pubmed. It is frustrating.