Diagnosis is guided by the person's presenting symptoms and laboratory findings. The gold standard imaging modality for the presence of gallstones is ultrasound of the right upper quadrant. There are many reasons for this choice, including no exposure to radiation, low cost, and availability in city, urban, and rural hospitals. Gallstones are detected with a specificity and sensitivity of greater than 95% with ultrasound. Further signs on ultrasound may suggest cholecystitis or choledocholithiasis. Computed Tomography (CT) is not indicated when investigating for gallbladder disease as 60% of stones are not radiopaque. CT should only be utilized if other intra-abdominal pathology exists or the diagnosis is uncertain. Endoscopic retrograde cholangiopancreatography (ERCP) should be used only if lab tests suggest the existence of a gallstone in the bile duct. ERCP is then both diagnostic and therapeutic.
Biliary colic
Gastritis
Pancreatitis
Hepatolithiasis
Biliary fistula
Cholecystitis
Cholangitis 
Ascending cholangitis