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Old 02-03-2013, 05:29 AM   #4
Join Date: Nov 2004
Posts: 5,795

The method would be very inaccurate. Your colon usually contains a considerable -- and very variable -- amount of air and other gases, and there's no accurate way to compensate for this or to expel it all. Look at abdominal X-rays and you can see these large areas of air.
Angell 105
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