Comparison of gamma camera and withdrawal methods for the measurement of gastric emptying.

In ten healthy volunteers the emptying of 300ml 15% glucose solution from the stomach was determined with two independent methods; a gamma camera method using 99mTc-DTPA as indicator and a withdrawal method, modified after Hunt, with PEG as indicator. At 40 min the gastric contents were withdrawn, and the stomach washed out. The quantity of indicator in the withdrawal and washout fluids was determined with both methods. A close correspondence was found between the methods.