Gastric Retention Interpreter
Classifies solid-meal gastric emptying from 2- and 4-hour retention
High-yield mode — key points, high-yield facts, tables & quizzes only. Toggle off for full text.
Enter the percent of the standardized solid meal retained at 2 and 4 hours to classify emptying and grade gastroparesis severity by the 4-hour value. Thresholds follow the consensus protocol (see Gastric Emptying Scintigraphy).
Gastric emptying — retention classifier
%
%
%
%
Standardized solid-meal (Tougas) upper limits: 90% (1 h), 60% (2 h), 30% (3 h), 10% (4 h); lower (rapid): 70% (1 h), 30% (2 h). Delayed if >60% at 2 h and/or >10% at 4 h; rapid if below the 1 h/2 h lower limits. The 4 h value is the key single point.
Evidence & sources
BConsensus gastric-emptying protocol — Abell TL, et al. (ANMS/SNMMI): 4-hour normal values and severity grading.