美国红十字会宣布进入第二次全国血液供应危机状态[1]。O型阳性血的供应量已跌至不足一天的全国需求量[1]。这一血型是最常见的输血血型，占红十字会血液分配的约60%，可用于约80%的患者[1]。
多重因素导致了此次危机。极端高温、空气质量恶化和食源性疾病爆发导致献血人数大幅下滑[1]，而夏季创伤季节恰好是医院血液需求的高峰期[1]。根据红十字会的统计，虽然美国人口的62%（约2.12亿人）符合献血资格，但每年仅有3%的符合条件者献血[1]。红十字会表示，若每个献血车增加三名献血者，即可结束这场危机[1]。
这是美国自2022年后再次发生全国血液危机，当时主要由新冠疫情和极端天气驱动[1]。康涅狄格州血液中心和维塔朗特等血液服务提供商也已宣布出现供应短缺[1]。
The American Red Cross has announced a second national blood supply crisis, with O-positive blood—the most commonly transfused blood type—now available in quantities insufficient to meet a single day of national demand [1]. The organization attributes the shortage to multiple converging factors: extreme heat, poor air quality, and a foodborne illness outbreak have all contributed to declining donation rates, while summer trauma season has simultaneously increased hospital blood requirements [1].
O-positive blood comprises approximately 60 percent of the Red Cross's blood distribution and can be used for roughly 80 percent of patients [1]. Despite this critical need, approximately 62 percent of the U.S. population—roughly 212 million people—are eligible to donate blood, yet only 3 percent do so annually [1]. The Red Cross stated that adding just three donors per blood drive could resolve the crisis [1].
This marks the second national blood supply crisis in recent years; the first occurred in 2022, driven primarily by the COVID-19 pandemic and extreme weather [1]. Other blood service providers, including the Connecticut Blood Center and Vitalant, have also declared supply shortages [1].