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The primary issue here is the interpretation of pH in those patients whoactually have an NG tube in place. The majority of those will be stressed inpatients who are already on a PPI or H2 antagonist, and hence the use of the gastic pH measurement is often uninterpretable, as both medications can raise you gastic pH to levels greater than 5. Hence the rocommendation should be inital X ray, and then daily pH AND gurgle test in those on acid suppresant. ------ACB discussion List Information-------- This is an open discussion list for the academic and clinical community working in clinical biochemistry. Please note, archived messages are public and can be viewed via the internet. Views expressed are those of the individual and they are responsible for all message content. ACB Web Site http://www.acb.org.uk List Archives http://www.jiscmail.ac.uk/lists/ACB-CLIN-CHEM-GEN.html List Instructions (How to leave etc.) http://www.jiscmail.ac.uk/