Bronchiolitis is diagnosed on the basis of the history and physical examination. There is no gold standard for diagnosing the disease. Although the viral etiology may be identified (e.g. by viral culture, nucleic amplification testing, or rapid antigen testing), there is no specific test that confirms the diagnosis of bronchiolitis itself. RSV rapid antigen testing, chest x-ray, complete blood counts, and basic metabolic panels may be indicated in specific clinical situations, though there is no evidence for routinely obtaining these tests. (American Academy of Pediatrics [AAP], 2006).