Inclusion Criteria:  Secondary peritonitis due to suspected hollow viscus perforation, anastomotic insufficiency, and/or abdominal abscess (including patients with the named abdominal emergencies as a complication after elective surgery) Scheduled emergency surgery with peritoneal lavage Age over 18 years Written informed consent  Exclusion Criteria  Pregnancy (will be ruled out using beta-hCG testing) Patients with primary or tertiary peritonitis