With all my line up tests they found I had some shadows on my lungs, and after having lumpectomies and all the treatment for the breast cancer / chemo, radio, herceptin, and continued on with the hormone blockers, I asked for another ultrasound on my lungs to see if the shadows were still there and they had gone. Mind you, I had to ask for the follow up tests for the shadows, mainly because I wanted to put my mind at ease/ or were they still there and needed further investigations. I wasn't diagnosed with mets, but whatever the shadows were, they were gone after all the chemo treatment.
Not the same as what you are specifically asking though, but like @TonyaM says, it is not black n white. You also have to be proactive and on top of your own medical conditions to know a certain amount of which tests you can suggest they do or ask for, if that makes sense. I will always politely ask for any tests I feel relevant to ease my mind somewhat.
