How is dx of acute calculous cholecystitis?

Labs: Leukocytosis, with or without increased ALP, LFTs, amylase, and total bilirubin. Ultrasound: Reveals inflammation of the gallbladder wall (> 4 mm), pericholecystic fluid and stones in the gallbladder. Positive predictive value of all three is 90%. Will also see dilation of the CBD if the stone has passed. HIDA scan (most sensitive) : A radionucleotide scan in which Technetium-99m labeled iminodiacetic acid is intravenously into hepatocytes. A normal gallbladder would be visualized within 1 hour.