Distribution of blood types in the U.S. as of 2021, by ethnicity

The most common blood type among the population in the United States is O-positive. Around 53 percent of the Latino-American population in the U.S. has blood type O-positive, while only around 37 percent of the Caucasian population has this blood type. The second most common blood type in the United States is A-positive. Around 33 percent of the Caucasian population in the United States has A-positive blood type.Blood type O-negativeThose with blood type O-negative are universal donors as this type of blood can be used in transfusions for any blood type. O-negative blood type is most common in the U.S. among Caucasian adults, at around eight percent of the Caucasian population, while only around one percent of the Asian population has O-negative blood type. Only around seven percent of adults in the United States have O-negative blood type. Blood DonationsThe American Red Cross estimates that someone in the United States needs blood every two seconds. However, only around three percent of age-eligible people donate blood yearly. The percentage of adults who donated blood in the United States has not fluctuated much for the past two decades. In 2020, around 13 percent of U.S. adults donated blood, compared to around 15 percent in 2003.

在美国，最为普遍的血型为O型阳性。在美国拉丁美洲人群中，约有53%的人拥有O型阳性血型，而仅约37%的白种人拥有此种血型。美国第二常见的血型为A型阳性。在美国的白种人中，约有33%的人拥有A型阳性血型。O型阴性血型拥有者作为万能供血者，其血液可适用于任何血型的输血。在美国，O型阴性血型在白种成年人中最为常见，约占白种人总人口的8%，而亚洲人群中仅有约1%的人拥有O型阴性血型。在美国，仅有约7%的成年人拥有O型阴性血型。献血情况美国红十字会估计，在美国，每两秒就有一个人需要输血。然而，仅有约3%的适龄人群每年献血。过去二十年里，美国成年人献血的比例波动不大。在2020年，约有13%的美国成年人献血，而2003年这一比例约为15%。