BACKGROUND The optimal observation time required to exclude hollow viscus injury in patients undergoing selective nonoperative management (SNOM) for abdominal stab wounds (SWs) remains unclear. The aim of this study was to determine the safe period of observation required before discharge. METHODS In this prospective observational study, all patients who sustained an abdominal SW were screened for study inclusion (July 2018 to May 2021). The primary study outcome was time to SNOM failure, defined as the need for surgical intervention after an initial period of observation. RESULTS During the study period, 256 consecutive patients with an abdominal SW met the study criteria. The mean age was 33 (26–46) years, and 89% were male. Of all patients, 77% had single SW, and 154 (60%) had an anterior abdominal SW (most common site right upper quadrant, 31%). Forty-six (18%) underwent immediate laparotomy because of evisceration (59%), hemodynamic instability (33%), or peritonitis (24%). The remaining 210 patients (82%) were taken for computed tomography scan (n = 208 [99%]) or underwent clinical observation only (n = 2 [
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