Semen Analysis

My Husband is nervous, tomorrow I'm going to call Doctor's office to make an Appointment for My Husband to get his Semen Analysis as soon as possible, He told me tonight that he feels nervous, that he can't stop thinking about it, He is a really Shy guy and We don't know if he would have to Masturbate at the Doctor's Office or they will give him a container so he could do it at home and Bringing to the office or how that works... Will be really appreciate if you guys tell me yours or Husband's experience about this??