Although evidence supports an increased risk of mortality after major trauma among patients with type O blood, the relationship between patient blood type and clinical outcomes aside from mortality has not been fully elucidated.


To examine the relationship between patient blood type and time to hemostasis after trauma and massive transfusion.


A secondary analysis of the Pragmatic, Randomized Optimal Platelet and Plasma Ratios (PROPPR) trial was performed (N = 544). Blood type was dichotomized into type O versus non–type O. It was hypothesized that patients with non–type O blood would achieve hemostasis more quickly owing to the theoretical presence of increased clotting factors. Bivariate analysis and multiple Cox regression were conducted to test this assumption.


No significant difference was found in time to hemostasis between patients with type O blood and those with non–type O blood. However, mechanism of injury, diastolic blood pressure, and international normalized ratio affected the time to hemostasis in these trauma patients.


This study showed no significant difference in time to hemostasis by blood type.

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