A professional who performs routine tests in medical laboratory to provide data for use in diagnosis and treatment of disease. Responsibilities include:

• Conducts quantitative and qualitative chemical analyses of body fluids, such as blood, urine, and spinal fluid, under supervision of medical technologist .
• Performs blood counts, using microscope.
• Conducts blood tests for transfusion purposes.
• May draw blood from patient's finger, ear lobe, or vein, observing principles of asepsis to obtain blood samples.
• May specialize in hematology, blood bank, cytology, histology, or chemistry.