The American Red Cross is calling for donations of all blood types as it faces a significant shortfall in its supply.

Donations are down about 8 percent over the last 11 weeks, the Red Cross said -- about 80,000 fewer donations than expected. There were also nearly 1,000 fewer blood drives in the first week of July compared with other summer weeks due the July 4 holiday weekend.

The agency said the number of donors continues to decline and it is concerned about an emergency situation in the coming weeks.

"Please, consider giving the gift of life. Each day donations come up short, less blood is available for patients in need - and you never know when it could be your loved one needing blood," said Jeff Allen, chief executive for the Red Cross Pacific Northwest Blood Services Region, in a statement.

Donors of all blood types and platelets -- a key clotting component of blood -- are urgently needed, the agency said.

To donate blood, call 1-800-RED CROSS (1-800-733-2767) or visit redcrossblood.org to make an appointment or for more information. Donors can also look up area blood drives on the Red Cross link.

A blood donor card or driver's license, or two other forms of identification are required at check-in. Individuals who are 17 years of age and older who weigh at least 110 pounds and are in generally good health may be eligible to donate blood.

-- Helen Jung