Hello Lisa and welcome to the site.
As Andrew says, there is no black and white written down that says this is a good PSA or a bad PSA.
Think of the scan as a precaution. Be grateful that the medical staff have taken on the possibility of spread because if it has they will be on the ball with treatment.
Please don't stress about what might be. We have many on here with very high PSA, spread and incurable but they get on daily with their lives, enjoying life even.
The site is quieter at weekends but I expect others will be along at some stage.
In the meantime, your best friend is in good hands, and has the support of a loving family.