metformin is to lower your blood sugar which also lowers the testosterone level that ur body makes for insulin. I dnt see a reason ur husband will need to be checked out unless they trying to find another way to help you get prego. As for as blood work it all depend on what they specifically looking for, which could include ur glucose and testosterone levels. hope that answer ur question.

most likely they'll test both of you... your blood, his blood and sperm as well as ask you tons of questions and do an ultrasound