The esophagus is a long, muscular tube that connects the throat to the stomach. Esophageal manometry is a test that shows whether the esophagus is working properly or not. It measures the rhythmic muscle contractions that occur in the esophagus when swallowing. The test also measures the force and coordination of esophageal muscles as they move food to the stomach. Esophageal manometry may be used to help diagnose diffuse esophageal spasm, achalasia, scleroderma.