Labs
CBC: Leukocytosis with neutrophil predominance
LFTs: Elevated alk phos and conjugated bilirubin
GGT elevation much more sensitive than alk phos
Blood cultures
Imaging
RUQ Ultrasound
Dilatation of CBD ( > 6mm) and presence of choledocholithiasis
May miss small CBD stones and in acute cases CBD may not have had time to dilate
ERCP
Should be obtained to confirm the diagnosis and for possible intervention
CBC: Leukocytosis with neutrophil predominance
LFTs: Elevated alk phos and conjugated bilirubin
GGT elevation much more sensitive than alk phos
Blood cultures
RUQ Ultrasound
Dilatation of CBD ( > 6mm) and presence of choledocholithiasis
May miss small CBD stones and in acute cases CBD may not have had time to dilate
Dilatation of CBD ( > 6mm) and presence of choledocholithiasis
May miss small CBD stones and in acute cases CBD may not have had time to dilate
Should be obtained to confirm the diagnosis and for possible intervention
Ascending cholangitis
Gallbladder disease
Choledocholithiasis
Symptomatic cholelithiasis 
Acalculous cholecystitis
Acute calculous cholecystitis
Acute cholecystitis
Chronic pancreatitis