Friday morning only 9 units of O-Negative remained on the shelves to supply 31 valley hospitals. "When I look at those shelves, I think the people of the Central Valley always respond when we need them. But it's something that you can't rely on somebody else doing the job," said Dean Eller with the Central California Blood Center.
Blood Center officials say donations have recently slowed and it'll take several days of heavy donations to return to normal levels.
They're asking donors to donate today or tomorrow.