Hi,
I live in Ireland and had severe back pain earlier this year, my onc began with a bone scan which showed one hot spot, so followed with an MRI that was inconclusive. I then had a clear pet/ct and as the area was too small to biopsy I waited two months to repeat the MRI which showed the spot was gone and all clear.
Thankfully we also have universal health care and I think these scans are the norm for suspected mets, depending what does or does'nt show on one will lead to another until they get answers.
My onc was very enouraged the pet scan was clear but think for suspected lung mets a CT or MRI may be better but not sure.
Good luck and I hope it's nothing serious!