A patient is scheduled for a solid-meal gastric emptying study and reports having eaten toast and coffee forty-five minutes earlier, since the appointment reminder only listed the arrival time. The study must measure emptying of the labeled test meal alone. Which preparation condition must be confirmed before imaging begins?

The required fasting interval must have passed before the labeled test meal is given. The recent toast and coffee may still be in the stomach when imaging starts; their contents are unlabeled and could contribute to the measured gastric activity, so the study would no longer measure emptying of the labeled test meal alone. The patient should therefore be rescheduled or managed according to the site’s protocol rather than given the test meal immediately. Checking blood glucose is a sound part of many studies, especially for patients with diabetes, because marked hyperglycemia can delay gastric emptying; however, an acceptable glucose value does not remove food already eaten from the stomach. Reviewing medicines that affect motility and withholding them for a protocol-defined interval can reduce medication-related effects, but it likewise cannot correct the recent meal. Confirming the standardized radiolabeled meal and planned serial images are ready supports a valid, reproducible acquisition, yet proper imaging technique cannot distinguish labeled meal from residual unlabeled food. Exam caveat: fasting duration and medication instructions vary by protocol, and patients should not stop prescribed medicines without clinical guidance. Practical check: confirm and document the last food and caloric drink, then verify the required fasting interval with the local nuclear medicine protocol before administering the test meal.