Exams and Tests

Measles is most often diagnosed by a history of exposure to the disease, the presence of the characteristic rash, a fever higher than 101°F (38°C) for 3 days or more, and other symptoms, including eye inflammation and chest congestion.

Blood tests (immunofluorescent antibody assay and ELISA-type assay) are often done to confirm the diagnosis and eliminate other illnesses as causes of the symptoms. Swabs from the nose or throat (viral culture) also may be tested for the measles virus. Chest X-rays may be done if your doctor suspects pneumonia.