Jolley et al used a formula to estimate esophageal length in children undergoing esophageal pH monitoring. The


Proximal point: maxillary incisors


estimated esophageal length in cm =

= (0.207 * (height in cm)) + 4.61


Day et al found that the formula predicted a length less than that seen at endoscopy, indicating that it would place the end of a tube or probe into the distal esophagus 1 - 3 cm above the lower esophageal sphincter (LES).


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