Hello Doctor, I would like to ask if it is a concern when an ultrasound does not detect the gallbladder? Thank you, Doctor.

Abdominal ultrasound is one of the routine examinations that uses ultrasound waves to create and reconstruct images of the internal structures of the body. Abdominal ultrasound can assess damage to organs such as the liver, gallbladder, urinary system, reproductive system, spleen, and pancreas. Therefore, is it necessary to fast or refrain from urinating before undergoing an abdominal ultrasound?