My sister had a mametry test and ph test for acid reflux disease. tests were neg but can she still have acid reflux/gerd?

Yes GERD: A syndrome due to structural or functional incompetence of the lower esophageal sphincter (les), which permits retrograde flow of acidic gastric juice into the esophagus.

Depends on test : If the test is done well it will be less likely. However symptoms are consistent with gerd, your doctor may ask you to follow standard gerd precaution and try a proton pump inhibitor for 4 weeks. Response will clinically confirm gerd or egd may be considered.

Every body refluxes: The tests help define the subgroup of refluxers that are at highest risk of erosive esophagitis and other related problems.If you burp, you refluxed air from the stomach.Everybody does, and most of us get heartburn on occasion. Gerd is just reflux with significant symptoms. Making wise dietary choices, avoiding caffeine and nicotine and not eating or drinking within an hour of sleep can reduce sx.