Background/Aims : Scintigraphic test for gastric emptying has not been widely used as a screening test for gastric motility disorders in Korea. Our aim was to develop a relatively inexpensive, accurate test using selected scintigraphic observations. Methods: Scintigraphic scans after ingestion of an egg solid meal containing 99mTc-Amberlite pellets were performed for 21 healthy volunteers and 50 patients with suspected motility disorders. Gastric emptying was analyzed by power exponential analysis. We compared the accuracy of selected scans with traditional, more detailed approaches. Results : Lag phase was well correlated with gastric residuals at 30 min and 1 hour. Half gastric emptying time was well correlated with gastric residuals at 1 hour and 2 hours. Gastric residual at 30 min was more accurate for the diagnosis of rapid gastric emptying with sensitivity and specificity over 90%. Gastric residual at 2 hours was more accurate at detecting delayed gastric emptying with sensitivity and specificity over 90%. Conclusions: Selective scintigraphic scans taken at 30 min and 2 hours provide an excellent screening method for detecting abnormal gastric emptying with acceptable sensitivity and specificity. This strategy provides a simple, inexpensive way to evaluate gastric emptying in clinical practice. (Kor J Gastroenterol 2000;36:283 - 292)