To Be A Blood Receiver From Pregnant Women Is Risky,- Researcher in the Netherlands studied 31,000 people who had received blood donations. They tracked sources of donor blood and analyzed death rates of recipients for three years. The only group that saw differences based on type of donor was men who received blood from women who had been pregnant. These men were more likely to have did after three years.

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Previous work pointed to a change in women’s blood that makes transfusions risky, known as TRALI. But it occurs soon after transfusion, and the deaths in the study were recorded as long as three years. Experts say that for now, there isn’t enough data to support changing current blood donation policies.