Reference Values for Various Types of Gastric Emptying Studies
| Study type | Reference value |
|---|---|
| Dual phase with egg (4-h study) (delayed solid emptying at 2 or 4 h is considered abnormal; delayed clear emptying at 1 or 2 h is considered abnormal) | Liquid: >40% at 1 h; >78% at 2 h |
| Solid: >10% but <70% at 1 h; >40% at 2 h; >90% at 4 h | |
| Solid-only with egg (4-h study) (delayed solid emptying at 2 or 4 h is considered abnormal) | >10% but <70% at 1 h; >40% at 2 h; >90% at 4 h |
| Solid-only with Ensure Plus (4-h study) | >10% but <70% at 1 h; >40% at 2 h; >90% at 4 h |
| Solid-only with oatmeal (1-h study) | >50% at 1 h |
| Liquid-only with formula or milk (2-h study) | >51% at 2 h |
| Clear liquid–only with water (30-min study) | Half-time < 25 min |