CBC
Chem
LFTs
Lipase
Coags
Urinalysis
Urine pregnancy (females)
Biliary ultrasound
?CXR
Consider if at risk for perforated ulcer
?ECG
If may be cardiac in nature
Consider if at risk for perforated ulcer
If may be cardiac in nature
Right upper quadrant abdominal pain
Gallbladder disease
Left upper quadrant abdominal pain
Symptomatic cholelithiasis 
Right lower quadrant abdominal pain
Choledocholithiasis
Left lower quadrant abdominal pain
Acute cholecystitis