Protocol for using pH strips to check NG tube position

Checks should be carried out:

Following initial insertion

Before starting each feed or giving medication

As well as misplacement upon insertion, NG tubes that were inserted correctly

initially can move out of the stomach at a later stage if the tube is dislodged

Once-daily, during continuous feed

Following vomiting, retching or coughing in case of displacement

If the tape around the nose is loose, or the visible tube appears longer than previously

documented

pH testing

pH testing of aspirate is the initial method of choice for checking tube

position

Ideally, use pH indicator strips that are CE marked, and have increments

of measurement marked on

NICE guidelines state that if the aspirate has a pH of 5.5 or less using pH

indicator strips, then feeding can be commenced as the tube is in the

stomach

Litmus paper should never be used - MHRA medical device alert. 14 June 2004