HI there K

Can't advise about the wait I'm afraid as I really don't know if there is a standard waiting time and different health authorities probably vary anyway.

What I can do is put your mind at rest to an extent about the risk of testicular cancer. There are lots of reasons for this sort of pain and swelling. It might be an hydrocele, the tube could be twisted, he might have been hit without realising it..... The best thing your husband could do at the moment is to contact the GP again. He should be able to ask to speak over the phone - a return call at a fixed time so it is like an appointment. Then he could ask about the expected time delay before the ultrasound and ask whether the GP has any clear idea of the problem. The GP will understand, it is common for patients to leave after news like this without taking all information in.

Keep  posting and let us know what happens