HARRISBURG – The American Red Cross is teetering on a blood shortage this winter, which could lead to a disruption in lifesaving care. Donors are urged to make an appointment to give blood or platelets as soon as possible. The Red Cross blood supply is under pressure following a busy holiday season when winter weather and busy schedules made it even tougher to ensure hospitals have the blood products needed for critical care. Without immediate action, doctors may have to make difficult decisions about which patients receive blood transfusions and who will need to wait. Donors with types O, A negative and B negative blood are especially needed now. Persons can make an appointment to give blood or platelets by visiting RedCrossBlood.org, downloading the Red Cross Blood Donor App or calling 1-800-RED CROSS (1-800-733-2767).