You notice that you haven't seen your neighbor, Mr. Smith, out in his yard for several weeks. He used to stand on
the front porch every night to smoke. When you next see Mrs. Smith, you ask about her husband, and she tells
you that he is in the hospital. Mr. Smith started coughing up blood, so his wife took him to the hospital, where
his PCP referred him to a cancer specialist. The pulmonary oncologist thinks that Mr. Smith may have
bronchogenic carcinoma. Which test would the doctor order to examine lung secretions under a microscope to
determine the presence of malignant cells?
