Do men need to see a fertility specialist?
Testing for fertility issues in men usually starts with a semen analysis, which can be done by most family doctors or internists. If that turns out normal, additional testing might be required. Your partner's doctor may then recommend him to see a urologist (a doctor that specializes in male reproductive health) or a fertility specialist.
A fertility specialist -- officially called a reproductive endocrinologist or RE -- is an ob-gyn who has had an extra three years of training (on top of four years of regular ob-gyn education). After completing these seven years of training, doctors take a series of written and oral tests to become board certified in reproductive endocrinology.
If you know that you or your partner have health conditions that may affect fertility or are older than 35, you may want to bypass your own doctors and head straight to an RE, who can help to diagnose and treat both men and women.