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The Oklahoma Blood Institute declared a statewide blood emergency Monday, saying there is less than a one-day supply available.

Leslie Gamble, an OBI spokeswoman, said low donor turnout in the past two weeks has led to a dire situation.

Donation at OBI was down at least 20 percent last week, she said.

The shortage is particularly concerning because blood donations usually decrease in the days just before and after Christmas, and no donations are taken Christmas Day or New Year’s Day, she said.

Winter weather that impedes travel can also cause low turnout, she said.

“We just need people to support the blood drives that are scheduled,” Gamble said.

Donors can also go to blood donation centers, she said.

“Make it another gift you give this time of year,” she said.

The need for blood is constant. Usually a three-to-five-day supply is kept because blood will expire if stored too long, she said.