Blood test: – to check for sing of infection and rule out anemia Stool test: – White blood cell present in the stool indicate ulcerative colitis. Colonoscopy: – To view entire colon using a thin, flexible, lightened tube with the attachment of camera and to collect a small sample of tissue for lab analysis. Sigmoidoscopy: – If the colon is severely inflamed than sigmoidoscopy is necessary. X-ray: – To see perforated colon CT-scan: – To suspect complication of ulcerative colitis such as the perforated colon. MRI: – To find out how deep infection is in colon