Histopathology (or histology) involves the examination of sampled whole tissues under the microscope. Three main types of specimen are received by the pathology laboratory. Specimens received by the pathology laboratory require tissue preparation then are treated and analysed using techniques appropriate to the type of tissue and the investigation required.
The tissue that is studied comes from a biopsy or surgical procedure whereby a sample of the suspect tissue is selected and sent to the laboratory. It is then processed and cut into very thin layers (called sections), stained, and examined under microscopes to characterize the details of the cells in the tissue.