Christine N. Booth, MD
Diagnoses of specific nongynecologic cytology samples may be enhanced with knowledge of certain laboratory test results. These include both exfoliative samples (cerebrospinal fluid, pericardial, peritoneal and pleural fluids) as well as fine needle aspirate cytology samples from body sites such as the thyroid, “neck,” lymph nodes and metastatic sites. Following an overview of the subject, a case-based approach is used to highlight laboratory tests that aid in rendering more specific cytologic diagnoses. The use of immunocytochemical stains on cytologic samples to help make more specific diagnoses are also covered.