Blood Assurance is making an urgent appeal for people to donate O-Positive blood, the most common blood type in the country.

Officials with Blood Assurance said that as of Thursday afternoon, it had only 110 units, which is a half-day supply. That’s 600 units short of where we need to be.

As a result of the low supply, Blood Assurance officials may be forced to urge area hospitals to postpone elective surgeries until the supply stabilizes.

O-positive is the most common blood type, accounting for nearly 40 percent of the U.S. population, and is always in high demand from area hospitals.

Donors are urged to schedule an appointment at www.bloodassurance.org/schedule or walk in to any donation center or mobile blood drive.

All donors who give through the end of the month will be entered into a giveaway promotion for a Macbook. Blood Assurance is giving away three of the laptops.