Final answer:
False, Eosinophils can be stained red to orange with eosin, and play a role in the immune response, particularly against parasites.
Step-by-step explanation:
The statement that Code 89190 is used to report a nasal smear for eosinophils is false. Eosinophils are white blood cells that play a critical role in the immune system. In a nasal smear, eosinophils can be identified by their distinct red to orange staining when an acidic dye like eosin is used.
Their granules and two- to three-lobed nuclei are distinctive under a microscope. Eosinophils are involved in various immune responses, particularly those against parasites like protozoa and helminths. Eosinophilia, or an increased number of eosinophils in the blood, may indicate a parasitic infection, allergies, or other medical conditions.
To accurately code for medical procedures, specific codes must be used as defined in the current procedural terminology maintained by health care professionals.