Normal oesophageal manometric features
| Basal LOS pressure | 10–45 mm Hg (mid respiratory pressure measured by station pull through technique) |
| LOS relaxation with swallow | Complete (to a level <8 mm Hg above gastric pressure) |
| Wave progression | Peristalsis progressing from UOS through LOS at a rate of 2–8 cm/s |
| Distal wave amplitude | 30–180 mm Hg (average of 10 swallows at two recording sites positioned 3 and 8 cm above the LOS) |
LOS, lower oesophageal sphincter; UOS, upper oesophageal sphincter.