Growing Demand for “Unvaccinated” Blood Raises Concerns
More patients are asking for blood from donors who have not received COVID-19 vaccinations, leading to potential delays in medical treatment and increased risks to health, experts caution.
A recent study published in the journal Transfusion shows no safety advantage to using “unvaccinated” blood. Currently, there is no established method to verify whether donated blood comes from vaccinated or unvaccinated individuals.
At Vanderbilt University in Tennessee, researchers observed 15 requests for unvaccinated blood between January 1, 2024, and December 31, 2025. The average age of those requesting this blood was 17, with over half being children.
Thirteen of these patients received blood donations from family members, a practice known as “direct donation.” This can be hazardous, as many first-time donors might have blood that carries harmful pathogens. The study authors noted that “direct donations may paradoxically increase risk.”
Two patients in the study faced severe health challenges after refusing standard blood transfusions. One developed anemia, a condition marked by a lack of sufficient healthy red blood cells, while the other suffered from hemodynamic shock—a critical situation where blood flow to vital organs is insufficient, potentially resulting in organ failure.
Since the rollout of COVID-19 vaccines, requests for unvaccinated blood have surged, creating ongoing challenges for blood transfusion services and healthcare providers. Researchers reported that these requests often led to delays and complications in patient care.
To address this issue, experts urge health systems to establish standardized procedures for handling unvaccinated blood requests. They emphasize that regulatory organizations reject these requests due to the lack of any evidence demonstrating unique risks from vaccinated blood donors.
The Vanderbilt study has limitations, primarily focusing on specific cases where special donations were made. It does not reflect the total number of requests nor situations resolved through discussions with healthcare providers, and it cannot establish causation between the refusal of standard blood and health outcomes.
In some states, proposals have emerged to allow patients to receive blood exclusively from unvaccinated donors. In Oklahoma, a proposal has been made to create a state-run blood bank for unvaccinated blood, but no such measures have become law.
Dr. Marc Siegel, a medical analyst, pointed out that these requests stem from a culture of fear. He noted that determining the vaccination status of blood donors might be complicated, as antibodies can be present due to both natural infection and vaccination.
Diane Calmus, vice president of government affairs for America’s Blood Centers, described requests for direct donations as quite rare—making up only about 0.06% of the U.S. blood supply. She stated that the absence of a test to identify vaccinated blood limits options for patients and emphasizes the importance of conversations with specialized doctors for anxious families.
Calmus highlighted that the need for blood donations is urgent and ongoing. “We need people—vaccinated or unvaccinated—to donate blood,” she stressed. “It’s the blood available that saves lives.”
Experts are calling for continued dialogue and guidance to ensure that patients receive safe and timely care during transfusions.
