Children with G-tubes typically only need a small flush, 3-5ml for a 12 inch extension, and 6-10ml for a 24 inch extension. The amount of flush should clear the extension set and button of formula or medication. For children with long tubes, the amount required depends on the length of the tube. Your child’s doctor may request you flush the tube with additional water if the child needs additional fluids or if you have a problem with the tube clogging frequently.
Children with GJ-tubes need a flush that will clear their extension set or tube on the outside plus the J-tube on the inside. Depending on the length of the inner J tube (22cm, 30cm, or 45cm), the size of the flush may vary. In general, a minimum of 10ml is recommended, though less may be used for a shorter inner J tube. For the 45cm length, at least 15mls should be used to ensure that the flush clears the J.
Ideally, you should flush before administering medication, between each medication, and after all medications are administered or the formula has finished. In reality, this may be too much water for many children. You should always flush after a series of medications have been administered, or when the formula is finished.
For children on continuous feeds, it is still wise to flush frequently, at least once every 4-8 hours, to prevent clogging.