Small bore ngt (Nasogastric tube) is a tube inserted through the
nostril (nare) that is flexible and soft (8 French-12 French
diameter) used for feedings, and kept in place longer than a large
bore ngt.
Large bore ngt (Nasogastric tube) is a tube inserted through the
nostril (nare) that is less flexible and more firm (14 French
diameter or larger) used for feedings, to give medications, and for
gastric decompression. It is kept in place for a shorter period
than a small bore ngt.