Which branch of pathology focuses on laboratory tests on body fluids and tissues for diagnosis?

The branch of pathology that concentrates on laboratory tests performed on body fluids and tissues for diagnostic purposes is clinical pathology. This area involves analyzing samples such as blood, urine, and other bodily fluids using various laboratory techniques to aid in the diagnosis of diseases. Clinical pathologists work closely with physicians to interpret test results and ensure appropriate care for patients.

In contrast, general pathology encompasses the study of disease processes and the mechanisms of disease across various specialties, rather than focusing exclusively on laboratory testing. Surgical pathology pertains to the examination of tissues removed during surgery to diagnose conditions, while forensic pathology involves the investigation of cause and manner of death, typically in legal contexts. Each of these branches serves distinct functions within the field of pathology, but clinical pathology is the specific domain that emphasizes laboratory testing for diagnostic purposes.