The Rehfuss method, also known as the Rehfuss maneuver, is a medical procedure used to assess the transit time of liquids in the stomach and small intestine. This technique involves administering a liquid marker and observing its passage through the gastrointestinal tract via X-rays. Although there are no widely recognized synonymous terms for the Rehfuss method, it can be referred to as the Rehfuss maneuver, Rehfuss technique, or Rehfuss test. These interchangeable terms are commonly used in medical literature and discussions to describe the same diagnostic procedure. These synonyms are useful to ensure clarity and facilitate effective communication among healthcare professionals discussing this particular gastrointestinal assessment method.