Abstract:Objective To analyze the predictive value of eosinophil (EOS) count combined with high-sensitivity C-reactive protein (hs-CRP) levels in adverse reactions to blood transfusion.Methods The clinical data of 85 inpatients who received blood transfusion in our hospital from May 2020 to January 2022 were retrospectively analyzed. According to whether adverse reactions occurred after blood transfusion, the patients were divided into control group (n =44, without adverse reactions after blood transfusion) and study group (n = 41, with adverse reactions after blood transfusion). Both groups received blood transfusion, and the differences of serum EOS count and hs-CRP levels before and after blood transfusion as well as the clinical data were compared between the two groups. The multivariable Logistic regression model was adopted to analyze the factors affecting the occurrence of adverse reactions to blood transfusion. The receiver operating characteristic (ROC) curve was plotted, and the area under the ROC curve (AUC) was used to analyze the predictive value of the differences of EOS count and serum levels of hs-CRP before and after blood transfusion for adverse reactions to blood transfusion.Results The proportions of patients with more than two sessions of blood transfusion and with the time from obtaining blood to blood transfusion no less than 30 minutes in the study group were higher than those in the control group (P < 0.05). There was no difference in the sex composition, age, body mass index (BMI), distribution of the department that the patients stayed, underlying diseases, history of smoking history, or history of drinking between the two groups (P > 0.05). The differences of EOS count and hs-CRP levels before and after the blood transfusion in the study group were higher than those in the control group (P < 0.05). The multivariable Logistic regression analysis demonstrated that more than two sessions of blood transfusion [O^R = 3.589, (95% CI: 1.477, 8.724) ], the time from obtaining blood to blood transfusion no less than 30 minutes [O^R = 3.881, (95% CI: 1.597, 9.431) ], increased difference of EOS count before and after blood transfusion [O^R = 2.765, (95% CI: 1.138, 6.720) ] and increased difference of serum hs-CRP levels before and after blood transfusion [O^R = 3.050, (95% CI: 1.255, 9.411) ] were factors affecting the occurrence of adverse reactions to blood transfusion (P < 0.05). The ROC curve analysis revealed that the sensitivities of the difference of EOS count before and after blood transfusion, the difference of serum hs-CRP levels before and after blood transfusion and their combination for predicting adverse reactions to blood transfusion were 70.73% (95% CI: 0.419, 0.753), 73.17% (95% CI: 0.428, 0.783), and 70.73% (95% CI: 0.405, 0.772), with the specificities being 75.00% (95% CI: 0.469, 0.851), 68.18% (95% CI: 0.434, 0.725) and 88.64% (95% CI: 0.573, 0.912), and the AUCs being 0.679 (95% CI: 0.569, 0.776), 0.644 (95% CI: 0.533, 0.745) and 0.823 (95% CI: 0.726, 0.898), respectively (P < 0.05).Conclusions The differences of EOS count and serum hs-CRP levels before and after blood transfusion can be used to predict the occurrence of adverse reactions to blood transfusion, and their combination exhibits higher predictive value.