Gastro-oesophageal reflux is best detected by
A i.e. Endoscopy - G-O-Reflux is best diagnoses by 24 hours Acid studyQ & the next best investigation is EndoscopyQ. - 24 hours PH recording (Acid StudyQ) is the gold standerd for GOR diagnosis.
Endoscopy
USG
Barium study
Isotope scan