Examiner can attempt to pass a 5 or 6 fr catheter from the nose to the oropharynx, alternatively the examiner can use a qualitative measure of nasal airflow (i.e. the movement of a wisp of cotton under the nostrils, fogging of a mirror)
Diagnosis is confirmed with CT imaging with intranasal contrast
Ideally diagnosis of this condition should be done immediately after birth
A thorough physical exam should also be performed to detect associated anomalies
Choanal atresia
Deviated or dislocated nasal septum
Duodenal atresia
Nasal septal hematoma
Branchial cleft anomaly
Nasal polyp
Hirschsprung's disease
Chordoma