Matthew, sorry to hear you and you wife are going through this , I am about 2 months ahead of you after a similar shock so my feedback would be you will know any diagnosis as a result of bone marrow test, scans ( mri and x Ray ) and blood tests… sounds like you are well into this and it is a difficult period whilst you wait for these results – one tip I was given which proved invaluable is to record your meetings with consultant ( ask them first ) and you learn so much when you listen back especially if they slip into the jargon. Myeloma is not straightforward to diagnose and you need all these tests to be done and they will all be helpful for you both to understand this and to ensure you get the right diagnosis which then determines your treatment …