When my friend had lung cancer they did Pet scans to see where it had spread in the body. If you have too many scans they actually give you cancer over time.
When I had cancer they did a iodine uptake and watched where it was taken up in my body, to see the spread.
Ask your Dr or anyone you come across at hospital, clinics, etc and see what they say. Tests are expensive and have an effect on the body so unnecessary tests are not going to be done by dr's if they don't think you need them
Hope I helped
Heidi
Good Luck with it all
xxx