If suspicion high, involve vascular surgery early
CBC
Chem 10
Type and Cross
PT/INR/PTT
Blood culture if fever - high risk for infections with secondary fistulas (ie grafts)
Aortic ultrasound and FAST exam to assess for AAA and Free Fluid
CXR for pre-op, if patient stable
ECG for pre-op
CTA of abdomen/pelvis, highly sensitive, if patient stable
Patient may need gastroduodenal endoscopy
Aortoenteric fisulta
Peptic ulcer disease 
Aortocaval fistula
Gastritis/esophagitis
Intersection syndrome
Gastric/esophageal varices
Angiogram complications
Mallory-Weiss tear