Purpose Acute appendicitis is a common general surgery presentation in NSW, with patients undergoing appendicectomy having variable hospital length of stay (LOS). Prolonged LOS in itself carries morbidity, as well as health economic implications, particularly for bed allocation and peri-operative efficiency.1 Day-only appendicectomy programs are emerging in NSW hospitals, highlighting the need to identify pre and intraoperative variables associated with longer LOS. Methodology A retrospective review of 300 emergency appendicectomy patients at Campbelltown Hospital, from January to June 2024, collected data on preoperative variables (ASA score, age, serum inflammatory markers and vital signs) and intraoperative variables (operative duration, conversion to open, drain usage, base of appendix involvement, macroscopic appendix appearance). Regression modelling analysed associations with LOS. Results ASA, base of appendix involvement, white cell count, conversion to open, and drain usage were statistically associated with LOS (p<0.05). Age, operative time, and heart rate were not strongly associated with LOS; C-Reactive Protein showed weak significance (p 0.07). Conclusion Our review identified modifiable and non-modifiable variables associated with longer LOS in emergency appendicectomy patients. These findings may inform identification and selection of patients suitable for day-only appendicectomies, potentially improving bed allocation planning, hospital efficiency and reducing costs. References 1. Bancke Laverde BL, Maak M, Langheinrich M, Kersting S, Denz A, Krautz C, Weber GF, Grützmann R, Brunner M. Risk factors for postoperative morbidity, prolonged length of stay and hospital readmission after appendectomy for acute appendicitis. Eur J Trauma Emerg Surg. 2023 Jun;49(3):1355-1366.