The American Red Cross has declared only its second-ever national blood supply crisis, and nonprofit blood services provider Vitalant is urging Central Coast residents to donate as the country falls below a one-day national supply of type O-positive blood, the most commonly transfused blood type. KSBY Vitalant blood donation center is located on Broad Street on the way to the SLO Airport at 4119 Broad St #100, San Luis Obispo, CA 93401. Over 60 percent of the population is eligible to donate, so we really need people to donate," Adler said. Adventist Health Sierra Vista Hospital in San Luis Obispo, the highest-level trauma care center in the region, says it is keeping a close watch on its inventory. KSBY will hold the annual Be a Hero Blood Drive on Wednesday, August 26, at locations in San Luis Obispo and Santa Maria.