Hi Steph, sorry that you have to be here but this is the best site to be on for help and information.
It is very worrying when waiting for test results but please try to not let it get to you as nothing changes by doing that except your stress levels.
The two scans will probably be an MRI and a bone scan, these will able to tell your step dad's urologist where any abnormalities are or indeed if there are any. This is standard procedure and it does not imply that he has cancer, if anything is found he will be informed during a consultation with the urologist.
Your step dad would be advised to either take someone with him as a second pair of ears or record the meeting or write down any details given to him. This will help later to be able to take it all in and to understand what he has been told.
It may be that after the scans he will need to have, what they call, a targeted bi-opsy where a suspect area has ten or twelve samples taken for further analysis.
If you come back to this site for advice there are various details that will be useful for others here to be able to help you better.
One being his PSA level. Also his Gleason score and any staging type.
Rest assured you will get good advice here, there are some very knowledgable people who have gone through so much as a PCa patient, Other halves or family members, their experiences are worth getting the benefit from.
You can download the "toolkit" or telephone the number on PCUK site for them to send you one.
Please do not waste your time doing doctor google searches you are already on the best site you can be and if you need to talk to someone then you can call the specialist nurses on here as well.
I know you are going mad with worry but try not to, try to stay positive not negative.
Worry about what "is" not what "might be"
Others will give more advice I am sure.
Best wishes, Chris/Woody
Life seems different upside down, take another viewpoint