How long is a reasonable amount of time between bronchoscopies for a child with a trach? how often should s/he have one?

Depends...: Age and underlying medical issues/conditions will dictate what is recommended. Some experts believe for children under 3 years of age that routine surveillance bronchoscopic airway evaluations are important to identify life threatening airway conditions that may otherwise go undetected. Surveillance could lead to determining your child's readiness for decannulation.

Bronchoscopies: Routine bronchoscopy at a defined time for a child with a tracheostomy is not defined. In general, these are performed when the child has an issue raising concern for airway obstruction (such as tracheal granuloma), tracheal bleeding, or in certain times when a severe infection is a concern. In addition, prior to tracheal decannulation, this may be performed.