'''Functional Lumen Imaging Probe''' ('''FLIP''') is a test used to evaluate the function of the [[esophagus]], by measuring the dimensions of the esophageal lumen using [[electrical impedance|impedance]] [[planimetry]]. Typically performed with sedation during [[upper endoscopy]], FLIP is used to evaluate for [[esophageal motility disorders]], such as [[achalasia]], [[diffuse esophageal spasm]], etc.<ref name=Savarino />
==Procedure==
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==History==
Early development of impedenceimpedance planimetry for evaluating the gastrointestinal tract began in the 1980s.<ref name=Gregersen>{{cite journal |last1=Gregersen |first1=H |last2=Lo |first2=KM |title=What Is the Future of Impedance Planimetry in Gastroenterology? |journal=Journal of Neurogastroenterology and Motility |date=30 April 2018 |volume=24 |issue=2 |pages=166–181 |doi=10.5056/jnm18013 |pmid=29605974|pmc=5885717 |doi-access=free }}</ref> FLIP was first developed with a short balloon catheter, which measures distension across the esophagogastric junction.<ref name=DeVault /> A second generation device was later released, which measures secondary peristalsis proximal to the EGJ.<ref name=DeVault>{{cite journal |last1=DeVault |first1=KR |title=Functional luminal imaging probe: an evolving technology for the diagnosis of esophageal motility disorders. |journal=Gastrointestinal Endoscopy |date=December 2019 |volume=90 |issue=6 |pages=924–925 |doi=10.1016/j.gie.2019.08.025 |pmid=31759418|doi-access=free }}</ref>
