A medical laboratory scientist (MLS), also known as a medical technologist or clinical laboratory scientist, works in a medical laboratory analyzing a variety of biological specimens. They are responsible for performing scientific testing on samples from patients and reporting the results to doctors

Medical laboratory scientists collaborate very closely with physicians and medical laboratory technicians in diagnosing and monitoring disease processes, as well as monitoring the effectiveness of therapy. Areas of medical laboratory training include microbiology, chemistry, hematology, immunology, transfusion medicine, toxicology, and molecular diagnostics.