The patient needs to be worked up with initial physical examination which includes looking for the testicular descent into scrotum
and if he has attained the sexual maturity characters according to age...
I would also ask how did he gave the sample and how much time lapse was there between his giving sample and it reaching the laboratory
Next I would advice the hormonal
assays which include serum F.S.H. And serum testosterone
.... Next in case of any suspicious findings in examination I would like to get a ultrasonography
of scrotum.... Later depending on the reports would like to plan the treatment