Pathology in medical terms is a specialty that deals with the diagnosis of disease based on the laboratory analysis of bodily fluids including blood and urine, as well as tissues.
Pathologists use tools of chemistry, clinical microbiology, hematology and molecula when they're doing pathology.
Pathologists also tests for things such as cancer and other diseases by examining the tissue or other body organ to find out if it's cancerous or not or has some other disease.