 but having only a one-day supply is really scary. Takahara said a multi-car accident can deplete the state's overall supply, and a single open-heart surgery can take up to 100 units of blood, so every donation counts. As an incentive, the blood bank has partnered with Special Olympics Hawaii this year as a beneficiary of their summer blood drive. It's also partnering with a Punahou High School student for an honorary blood drive for the student's grandmother today,