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Background Temporary elevation of white cell count (WCC) and platelets are commonly observed after splenectomy and can therefore make it difficult for the surgeon to distinguish a normal physiological response from potential infection. Clinicians are often misled by elevated post-operative WCC after splenectomy, resulting in delayed discharges and prolonged unnecessary hospital stays for patients. The aim of this study was to establish what constitutes a normal rise in WCC and platelets after splenectomy. Methods All 127 patients who had undergone a splenectomy between July 2016 and January 2021 were identified from a search of our centre's hospital episode statistics data.  WCC and platelet count on post-operative days one to seven as well as at least one long-term follow-up result count were identified from electronic hospital records. Hospital records were searched for data on pre-operative steroid administration and peri-operative infections. These cohort data were retrospectively analysed in SPSS using stepwise logistic regression, correlation analysis, and T-tests, as well as descriptive statistics. Results 86 (68%) patients underwent an elective splenectomy and 41 (32%) an emergency splenectomy. 35 (27.6%) patients developed infections post-operatively, while 92 (72.4%) did not. Logistic regression suggested that a raised WCC (above 17.5x109/L) at day 3 post-op was a significant predictor of infection (p &amp;lt; 0.001): average WCC at day 3 for patients with infection was 20.00x109/L (SD = 6.23x109/L) compared to 14.86x109/L (SD = 4.01x109/L) for those without. Infective outcomes were not influenced by whether the surgery was emergency or elective. Overall, average WCCs were 9.63x109/L pre-operatively and 15.07x109/L long-term post-operatively. Even in the absence of infection, splenectomy led to a long-term rise in WCC of 3.8x109/L from baseline, to an average of 13.0x109/L [SD = 5.41x109/L): a T-test on the 56 patients without infection and with both pre-op and long-term WCCs showed a mean rise of 3.76x109/L, p &amp;lt; 0.0001). Platelet count was not correlated with infection, though platelet counts rose from a mean of 261 × 109/L (SD = 103.4x109/L) pre-operatively to 581 × 109/L (SD = 236.3x109/L) at 7-day and 619 × 109/L (SD = 293.5x109/L) at long-term follow up across all patients – an average increase of 357 × 109/L, which did not significantly differ between patients with and without infective complications. Conclusions A rise in WCC and platelet count is normal post-splenectomy.  A rise in WCC&amp;gt;17.5x109/L on day 3 post-splenectomy is strongly correlated with infection (regardless of trauma or platelet count). Long-term follow up suggests that while much of the WCC increase is transient, WCC remains higher than pre-operatively, as does platelet count, in post-splenectomy patients. A raised WCC or platelet count without signs of infection should not preclude timely discharge in otherwise well patients.

P-BN49 The predictive role of white cell and platelet count for infective complications following splenectomy