what is haematology
Hematology, also spelled haematology (from the Greek αἷμα, haima blood and -λoγία), is the branch of medicine concerned with the study, diagnosis, treatment, and prevention of diseases related to the blood. Hematology includes the study of etiology.
Histology: The study of the form of structures seen under the microscope (light, electron, infrared). Also called microscopic anatomy, as opposed to gross anatomy which involves structures that can be observed with the naked eye.