Blood is added in blood medium agar at following concentration

Blood is added to blood medium agar at 5 - 10% concentration.
Blood agar plates (BAPs) contain mammalian blood, typically at a concentration of 5 - 10%. BAPs are enriched, differential media used to isolate fastidious organisms and detect hemolytic activity.
It also contains meat extract or yeast extract, tryptone, sodium chloride and agar.