Laboratory: CBC, CRP, coagulation, creatinine, electrolytes, blood type, antibody screening test, if applicable, CEA
In case of perforated sigmoid diverticulitis: CT abdomen/pelvis with i.v. and rectal contrast administration
In case of perforated carcinoma: CT abdomen/pelvis with i.v. and rectal contrast administration
In case of postoperative anastomotic insufficiency: CT abdomen/pelvis with i.v. and rectal contrast administration
In case of suspected carcinoma and anamnestically impaired sphincter function:
- Clinical examination including digital rectal examination. This allows for an assessment of the height of the tumor and its mobility relative to the surroundings in the case of a rectal tumor.
- Rigid rectoscopy to determine the distance from the lower edge of the tumor to the anocutaneous line;
- Colonoscopy with biopsy for histological confirmation (mandatory) Note: If a colonoscopy is not possible preoperatively due to an impassable stenosis, it should be performed 3-6 months postoperatively.
- CT abdomen/thorax, MRI pelvis for staging, if applicable, endosonography, MRI liver or contrast-enhanced ultrasound of the liver
- Sphincter function measurement (clinically and/or manometrically) to objectify sphincter function