Under general supervision, performs routine and special laboratory assays of patient specimens (e.g., body fluids, exudates, skin scrapings or surgical specimens), exercising independent judgment when evaluating the validity of test results prior to result reporting. Provides data for the diagnosis, treatment and prevention of disease. Operates and calibrates all equipment in the area of specialization, evaluates the validity of laboratory data, records tests results, communicates with physicians, pathologists and nursing staff regarding test procedures and results.