<prompt> Investigation of choice for gall bladder stone is: March 2010OCGUSGPTCX-ray  <response>: Ans. B: USG Investigation for gall stones: Ultrasound is the initial investigation of choice Diagnostic features on ultrasound include - Presence of gallstones - Distended thick-walled gallbladder - Pericholecystic fluid - Murphys sign demonstrated with ultrasound probe If diagnostic doubt a HIDA scan may be useful-Will show failure of isotope hydroxyiminodiacetic acid uptake by gallbladder 