The American Red Cross has a critical shortage of type O blood and urges eligible donors to give now to help patients facing trauma and other life-threatening situations, according to a press release.

As a thank-you for helping replenish the blood supply, all donors who come to give blood or platelets now through June 10 will receive a $5 Amazon.com Gift Card via email.

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Right now, the Red Cross has less than a two-day supply of type O blood available for emergency rooms, where it can be most critical. That means just six units of type O blood are available for every 100,000 people, but at least 14 are needed every day.

While just 7% of the U.S. population has type O negative blood, it can be transfused to patients with any blood type and is what hospital staff reach for during emergencies when there isn’t time to determine a patient’s blood type. Type O positive blood is the most transfused blood type and is also critical in trauma situations.

Information: RedCrossBlood.org/Together

Those interested in hosting a blood drive can learn more and sign up to sponsor a drive this summer by visiting RedCrossBlood.org/HostADrive.