RIO DE JANERIO, BRAZIL - The stock of five blood types at the Fundação Pró Sangue - São Paulo Hemocentro (blood bank) reached critical levels on Wednesday, March 17th: O positive, O negative, A positive, A negative and B negative. A critical level means that the blood supply is only available for one more day, at most.
The foundation's online donation scheduling system has 90% free slots. With the exception of next Saturday, March 20th, which is the most demanded day and with all vacancies filled, donors may choose the best place and time to donate on other days . . .