Objective: To analyze the demographic characteristics, return donation patterns, and risk of adverse reactions among donors temporarily deferred due to blood pressure abnormalities, so as to provide an evidence-based foundation for optimizing pre-donation blood pressure screening strategies, enhancing donor retention, and ensuring blood supply safety. Methods: Data from 2.939 million donor instances were collected through the Information Management System at the Beijing Red Cross Blood Center between January 2015 and August 2025. The analysis specifically focused on the 11 600 instances of donors temporarily deferred due to abnormal blood pressure, examining demographic characteristics (age, and gender) and donation-related features (number of donations, donation site, and type of donation). Further analysis was conducted on the return donation patterns, including the return rate, time interval to return, and the incidence, type, and severity of adverse reactions among returned donors. Results: Distribution of abnormal blood pressure: Among the 11 600 instances of abnormal blood pressure, the prevalence was significantly higher in males (0.48%, 10 111/2 086 909) than in females (0.17%, 1 465/852 090). The 46-55 age group had the highest prevalence (0.88%, 2 925/329 235), and the differences across age groups were statistically significant. The prevalence was, higher among repeat donors (0.41%, 5 242/1 276 452) than first-time donors (0.38%, 6 334/1 662 547). The prevalence at mobile donation sites outside the blood center (0.06%, 350/596 104) was higher than fixed donor centers (0.50%, 10 225/2 052 290) and group donation drives (0.34%, 1 001/290 608). Return donations: A total of 19.49% (2 256 out of 11 576) deferred donors returner and successfully donated. Among these donors, 36.17% (816 out of 2 256) returned within 7 days, while the highest proportion of returns was observed within 31-182 days (25.44%, 574/2 256). A higher return rate was observed among male donors (20.17%, 2 039/1 0111) compared to female donors (14.81%, 217/1 465). The return rate for repeat donors (43.02%, 2 255/5 242) was significantly higher than that of first-time donors (0.02%, 1/6 334). Individual donors showed a higher return rate (20.95%, 1 986/9 479) than group donors (12.88%, 270/2 097), with all differences being statistically significant (P<0.05). The differences in return rates across age groups were not statistically significant (P>0.05). Adverse reactions: The incidence of adverse reactions after return was 0.09% (2/2 256), significantly lower than the overall adverse reaction incidence during the same period (0.20%, 5 981/2 938 999). Both adverse reactions were local reaction (category A1, pain or bruising at the puncture site), with no reported cases of systemic vasovagal reactions (VR) or severe adverse events. Conclusion: The current blood pressure screening criteria may lead to the unnecessary deferral of eligible donors. The risk of adverse reactions is extremely low among returned donors who were deferred for abnormal blood pressure. A relaxation of the blood pressure screening criteria is therefore suggested, coupled with the optimization of donation site environment and blood pressure measurement procedure with reference to expert consensus to enhance donor retention and blood supply safety.

【Objective】 To explore the relationship between climate factors and the number of street voluntary blood donors in Beijing and develop a reliable predictive model, so as to provide reference for donor recruitment. 【Methods】 The data of weather and the number of street blood donors from January 2018 to October 2019 were collected to formulate generalized additive model(GAM) and autoregressive integrated moving average model(ARIMA), and the predicative accuracy of the two models was assessed using data from November to December 2019. 【Results】 GAM indicated that the number of donors decreased when the wind force was 4 to 5 (95%CI: 0.805, 0.995), and the number on weekends and official holidays was 1.562 (95% CI: 1.510, 1.617) and 1.779 (95%CI: 1.035, 3.055) times that of the working day respectively. The number of blood donors increased with the elevation of temperature until 25℃, then declined with temperature increasing slowly. The two-day predictive accuracy of GAM and ARIMA was 92.14% and 90.55%, with overall accuracy at (84.46±11.12)% and (87.65±9.3)%, respectively. 【Conclusion】 Considering official holiday, strong wind and temperature, etc, the ARIMA model runs stable overall, while GAM is good at short-term prediction. The comprehensive use of two predictive models is helpful in guiding the recruitment of blood donors.

【Objective】 To investigate the factors influencing individual′s intention to donate blood, so as to provide targeted recruiting strategies for blood collection agencies. 【Methods】 Since behaviors can be changed by threat appraisal and coping appraisal in terms of protection motivation theory(PMT), a questionnaire including risk of health, fear, safety risk, policy risk, reaction acceptance, knowledge concerning donation, donation reward, self-efficiency, and donation intention was composed. Blood donors, their companions and pass-by respondents at one street donation site in the urban area of Beijing were selected through convenience sampling from April to August 2019. 【Results】 732 out of 800 questionnaires were valid, and the score of blood donation intention was 4.238±0.744. Univariate analysis demonstrated that the blood donation intention of men was significantly higher than that of women (P<0.05). Multivariate regression suggested that the most effective factor was self-efficacy (P<0.05) and knowledge concerning donation (P<0.05). The intention to donate blood was discouraged by safety risk (P<0.05) and fear (P<0.05). Compared with those without blood donation experiences, the fear of first-time blood donors could reduce the intention to donate blood in the future (P<0.05). 【Conclusion】 Measures to improve individual′s self-efficacy, popularize knowledge concerning blood donation, and reduce, the fear of blood donation are beneficial to improve the intention of blood donation and promote the development of voluntary blood donation.

【Objective】 To investigate the tension of donors during blood donation, so as to explore the utmost period for proper psychological intervention. 【Methods】 The donation procedure, from the completion of blood donation consultation form to the end of blood donation was divided into 17 steps, and donors were asked to recall the degree of tension at each step after the donation. 【Results】 71.65%(207/293) of the donors reported tension during donation, dominated by female donors(P<0.05)and first-time donors(P<0.05). The beginning of phlebotomyis the most intense moment.First-time donors (P<0.05), accidental donors (P<0.05) and female donors (P<0.05) were more nervous than others. Statistical differences in needle fear before and after the donation was observed(P<0.05). Multivariate analysis indicated that donation history and fear of puncture would affect the nervous level during donation. 【Conclusion】 More attention should be paid to female donors and first-time young donors to improve their self-efficacy and reduce the tension by explaining the donation procedure in detail, promoting donation appointment, and shielding the needles and blood bags.

Objective:To explore the effect of expected pain of blood donation puncture on actual puncture pain.Methods:A total of 350 blood donors from a blood collection site in Beijing from July 2019 to August 2019 were selected by the convenient sampling method. Blood donors evaluated the pain degree of blood donation puncture before blood test by using VAS, and VAS was used to evaluate the actual pain degree again after successful puncture. The expected pain score was compared with the perceived puncture pain score after blood donation and the influencing factors of the donors' puncture pain were analyzed.Results:The expected pain score of the 350 blood donors was (3.16±2.06) , and the perceived puncture pain score after blood donation was (2.99±1.89) . There were statistically significant differences in the expected pain assessment scores of blood donors of different genders and whether they donated blood intentionally ( P<0.05) . The interactions between gender, blood donation preparation, blood donation history, age and expected pain were statistically significant ( P<0.05) . Conclusions:Before blood donation, quality service can reduce puncture pain of female blood donors. Blood donation publicity don't need to avoid the pain of blood donation, we should improve the acceptance of puncture pain among blood donors and encourage the public to be fully prepared to participate in blood donation.