![]() ![]() Imaging tests, such as a chest X-ray or CT scan can check for lung complications. In severe RSV cases that require hospitalization, additional testing may be needed. The most common is a mouth swab or a blood test to check white blood cell counts and look for viruses. In this case, they may want to run lab tests to confirm the diagnosis. However, your doctor may suspect RSV based on your medical history, time of year and a physical exam. How RSV Is Diagnosedīecause mild RSV symptoms are similar to the common cold, testing usually isn't required to diagnose the infection. In addition, their mouth, lips and fingernails may turn a bluish color due to lack of oxygen. This can be identified by "caving-in" of the chest in between the ribs and under the ribs (chest wall retractions), "spreading-out" of the nostrils with every breath (nasal flaring), and abnormally fast breathing. Infants with severe RSV will have short, shallow and rapid breathing.
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