The Supply Of Blood At One Tri Cities Area Hospital Is Critically Low. Officials At Johnston Memorial Hospital’s Blood Bank In Abingdon Say Supplies Of Types O-Negative, O-Positive, A-Negative, And A-Positive Are Extremely Low. Blood Can Be Donated Today Until 3 p.m. at JMH And Also On Thursday from 7 a.m. Until 3:30 pm. Donations Will Also Be Accepted Today From 4 pm Until 7 pm At Chilhowie Christian Church In Chilhowie.