CBC, LFTs, coags if bleeding or signs of hepatic involvement
CT abdomen- not definitive but may catch large mass or other alternative diagnoses
Definitive diagnosis not likely to be made in ED, but suggestion of malignancy may be made on imaging if large mass seen
Colonoscopy with biopsy
Serum CEA
Surgical pathology
Colonoscopy with biopsy
Serum CEA
Surgical pathology
Colorectal cancer
Upper GI Bleeding
Colitis
Diverticular disease
Ischemic colitis
Diverticulosis
Peptic ulcer disease
Diverticulitis