Explore esophageal pH testing in this comprehensive lecture by Dr. Lisa D. Lin, health sciences assistant clinical professor at UCLA. Learn when to consider pH testing, available types and their appropriate selection, pros and cons of each method, and how to interpret test results. Gain insights into the algorithm for upper endoscopy, atypical esophageal symptoms, and various pH testing measurements including reflux symptom association scores and symptom association probability. Delve into different types of esophageal pH testing, such as impedance pH tests and wireless pH tests, understanding their functionalities, limitations, and how they can impact patient management. Conclude with key takeaway points to enhance your understanding of this crucial diagnostic tool in gastroenterology.