During the test, you will be asked to swallow a small amount of water to evaluate how well the sphincter and muscles are working. The sensors also measure the strength and coordination of the contractions (spasms) in the esophagus as you swallow. The test lasts 10 to 15 minutes. When the test is over, the tube is removed.
https://my.clevelandclinic.org/health/diagnostics/4952-esophageal-manometry-test/test-details

