| AET | Acid Exposure Time |
| AUC | Area Under The Curve |
| CI | Confidence Interval |
| DCI | Distal Contractile İntegral |
| FH | Functional Heartburn |
| EoE | Eosinophilic esophagitis |
| HREM | High-Resolution Esophageal Manometry |
| GERD | Gastroesophageal Reflux Disease |
| GI | Gastrointestinal |
| HH | Hiatal Hernia |
| LA | Los Angeles |
| LES | Lower Esophageal Sphincter |
| mmHg | Millimeters of mercury |
| MNBI | Mean Nocturnal Baseline Impedance |
| MII-pH | Multichannel Intraluminal Impedance–pH |
| NCCP | Non-Cardiac Chest Pain |
| NERD | Non-Erosive Reflux Disease |
| IEM | Ineffective Esophageal Motility |
| IQR | Interquartile Range |
| IRP | Integrated Relaxation Pressure |
| PSPW | Post-Reflux Swallow-Induced Peristaltic Wave |
| PPIs | Proton Pump Inhibitors |
| RE | Reflux Episode Count |
| ROC | Receiver Operating Characteristic |
| SAP | Symptom Association Probability |
| SI | Symptom Index |
| Ω | Ohm |