CBC, BMP, PT/PTT, LFTs, lipase, T&S
Blood cultures (as long as this does not delay the initiation of antimicrobial therapy)
Imaging (use only if physical exam is non-specific, exam findings of peritonitis warrant immediate surgical consultation):
X-ray vs CT abdomen/pelvis with IV contrast (and PO contrast if possible)
IV contrast improves soft tissue resolution and improves diagnostic accuracy and should be considered even in the presence of acute kidney injury.
PO contrast improves<unk>  resolution and identification of<unk> . Presence of PO contrast may help to distinguish intra-abdominal abscesses from adjacent<unk> .
X-ray vs CT abdomen/pelvis with IV contrast (and PO contrast if possible)
IV contrast improves soft tissue resolution and improves diagnostic accuracy and should be considered even in the presence of acute kidney injury.
PO contrast improves<unk>  resolution and identification of<unk> . Presence of PO contrast may help to distinguish intra-abdominal abscesses from adjacent<unk> .
IV contrast improves soft tissue resolution and improves diagnostic accuracy and should be considered even in the presence of acute kidney injury.
PO contrast improves<unk>  resolution and identification of<unk> . Presence of PO contrast may help to distinguish intra-abdominal abscesses from adjacent<unk> .
Physical exam vs. imaging
Bowel perforation
Acute myocardial infarction
Large bowel obstruction
Intestinal obstruction
Intestinal ischemia
Acute mesenteric ischemia
Mesenteric ischemia
Mesenteric venous thrombosis