Which of the following is NOT a primary sample type analyzed in cytology?

Blood samples are typically not considered a primary sample type in cytology because cytology primarily involves the study of individual cells obtained from tissue samples or fluids. In cytology, the focus is generally on analyzing cells for abnormalities, which are derived from specific tissues or lesions rather than from whole blood.

Primary sample types analyzed in cytology include fine needle aspirates, which are used to obtain cells from solid masses or tumors; smears, which involve spreading a sample of cells onto a slide for examination; and various fluids such as pleural, peritoneal, or cerebrospinal fluids, from which cells can be collected and examined. These types of samples directly relate to the analysis of cellular morphology and pathology, making them central to the field of cytology.