Fine Needle Aspiration Cytology is the abbreviation for Fine Needle Aspiration Cytology. The FNAC test is a simple, rapid, and low-cost test used to assess a specific condition or body region. It involves aspirating cells from a particular region of the body using a fine gauge needle. The sample is then sent to the lab, where it is examined under a microscope through several processes. This test is quite helpful in diagnosing inflammatory diseases and malignancies of varying types. This technique is commonly used for examination of the breast, kidney, liver, lungs, prostate, pancreas, salivary glands, retroperitoneum, and lymph nodes.