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Delayed gastric emptying after COVID-19 infection. Residual percentage of stomach technetium-99 activity is depicted at the listed times after ingestion of a labeled meal, along with the corresponding upper limit of normal at our institution. Maximum values in normal subjects are 100% at 30 minutes, 90% at 1 hour, 60% at 2 hours, and 10% at 4 hours. (If abnormal at 4 hours, 10–15% residual is considered mildly delayed, 15–35% moderately delayed, and >35% markedly delayed emptying.).
