CBC
Chemistry
LFTs
Blood cultures
RUQ Ultrasound
CBC
Leukocytosis (70-85% of patients)
LFTs
Hyperbilirubinemia
Mildly elevated alkaline phosphatase
Transaminitis
RUQ Ultrasound
Absence of gallstones or sludge
Thickened wall (>5 mm) with pericholecystic fluid
Positive sonographic Murphy's sign
Emphysematous cholecystitis with gas bubbles arising in fundus of gallbladder
Frank perforation of gallbladder with associated abscess formation
Leukocytosis (70-85% of patients)
Hyperbilirubinemia
Mildly elevated alkaline phosphatase
Transaminitis
Absence of gallstones or sludge
Thickened wall (>5 mm) with pericholecystic fluid
Positive sonographic Murphy's sign
Emphysematous cholecystitis with gas bubbles arising in fundus of gallbladder
Frank perforation of gallbladder with associated abscess formation
Acalculous cholecystitis
Gallbladder disease
Acute calculous cholecystitis
Symptomatic cholelithiasis 
Choledocholithiasis
Ascending cholangitis
Acute cholecystitis
Symptomatic cholelithiasis