MATERIALS AND METHODS
The expired human packed blood cells used in this research was obtained
from the Blood Bank of Batangas Regional Hospital. The freshly collected
blood was obtained from one of the members of the research team. Sheep
blood that served as the standard came from Research Institute for Tropical
Medicine in Alabang, Muntinlupa City.
The researchers employed the red cell suspension technique in the
preparation of blood agar having expired human blood as the main component.