Whats the next step?

Oops.....pressed the wrong button too early!

My partners recent SA sample came back as 0 with him having azoospermia. He has to produce another sample on April 17th. Recent bloodwork has come back normal. We have a doctors appointment 27th March with his doctor to discuss the results of his bloods. What is our next step now? Previously the doctor said if his bloods came back normal they will have to look into a possible blockage....what other tests should we ask for now?

Looking into blockage is the next step, along with possibly checking for Cystic Fibrosis if his Vas Deference is blocked...