Veterinary Hematology is more than just blood cells. Blood, highly functional and truly definitive, does much more than provide for the transport of cellular metabolites and waste products. Blood is made up of four major components: Plasma, Red Blood Cells, White Blood Cells, and Platelets.Each component possesses its own diagnostic significance in the veterinary clinical setting.Without blood, you have no viable mammal life. Therefore without blood, the clinician has no valid clinical picture o.