GERD diagnosis begins with the evaluation of the patient’s signs and symptoms and a physical examination. The tests done to confirm GERD or look for complications include: Upper endoscopy: Help detect inflammation of the oesophagus. Ambulatory 24-hour pH probe: Measures when and for how long stomach acid regurgitates in the oesophagus during 24 hours. Bravo wireless oesophageal pH monitoring: Measures when and for how long stomach acid regurgitates in the oesophagus during 48 hours. Esophogram: X-ray imaging is used to look for problems in the upper digestive tract. Oesophageal manometry: Measures the strength of the oesophageal muscles. Transnasal esophagoscopy: Used to look for any damage in the oesophagus or stomach.