Blood tests for patients with rhinitis mainly include the following: 1. Routine blood tests, by checking the routine blood can determine whether the patient has a viral infection, bacterial infection, or suggest the possibility of allergic rhinitis. If the patient’s eosinophils are elevated suggesting a possible allergic tendency, if the patient’s lymphocytes are elevated it may suggest a viral infection. If the patient’s leukocytes and neutrophils are elevated, it suggests that the process of rhinitis may be accompanied by bacterial infection, accompanied by purulent inflammation of the nasal cavity and other related changes. 2. Blood sampling for allergens is the most common, mainly to check whether the patient’s total IgE is elevated and to determine whether the patient’s body is in an allergic state. The concentration of specific allergens, such as the presence of milk, pollen, dust mites and other allergens, is checked by blood sampling. If the concentration is significantly elevated and exceeds the reference value, it indicates that the patient may be allergic to the substance. If a patient is suspected of having nasopharyngeal carcinoma or has a family history of nasopharyngeal carcinoma, a blood test for EBV serology can be performed to determine whether the patient’s EB antibodies are consistently elevated, suggesting whether nasopharyngeal carcinoma may exist in the patient’s body. Of course, the blood test for nasopharyngeal cancer is only a reference and cannot be used as a basis for diagnosis.