I really don't think that his testosterone has anything to do with you miscarrying. Unless of course there is something wrong with his sperm that will cause the embryo to fail. Have you been tested to why you may be miscarrying???? I would try using progesterone supplements and baby aspirin from the day you find out your preggers to decrease the chance for miscarriage.
I read somewhere that low testosterone can cause male infertility and I was wondering if that could hinder it. I have been tested and all genetics and things came back normal including genetics on my husband.
Low testosterone would not be the reason behind your miscarriages. Sorry to say.