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Cytotechnologists primarily examine prepared slides of body cells by viewing them through a microscope. In any single slide there may be more than 100,000 cells so it is important that cytotechnologists be patient, thorough, and accurate when performing their job. They are required to study the slides and examine cell growth patterns, looking for abnormal patterns or changes in a cell's color, shape, or size that might indicate the presence of disease. In addition to analyzing Pap smears, cytotechnologists interpret specimens taken from the lung, breast, central nervous system, gastrointestinal tract, bladder, body cavities, liver, lymph nodes, thyroid, and salivary glands.