Pain at mid back especially at scapular border is due to the reffered pain due to anyGB pathology or the GB Calculus. Go to know HIDA revealed non functioning of GB. and chest CT. To, know the status of GB and the neighbouring organ it better to perform CECT Abdomen and Pelvis. Also perform the Basic Blood tests including liver
function test .Also you can perfrom the Ultrasound
Abdomen and pelvis before CECT .