The American Red Cross says blood and platelet donations are urgently needed after the agency had to cancel blood drives during this week's winter storm.
The organization cancelled seven blood drives in Minnesota, Wisconsin and South Dakota on Wednesday, resulting in about 400 fewer donations.
Platelet donations are especially needed, as they have a shelf life of only five days. Platelets are used to help cancer patients who rely on transfusions following chemotherapy and radiation treatments.
Donors must be 16 years or older and weigh at least 110 pounds. Sixteen-year-olds need parental permission to donate blood, and some teenage donors have to meet more specific height and weight requirements.
The Red Cross is asking potential donors to call: 1-800-448-3543 to make an appointment or receive more information.
The agency is the single largest supplier of blood products to hospitals throughout the United States.