The purpose of this study is to evaluate the utility of a new device - an external wireless patch system (WPS) - to measure gastric motility and to compare this external wearable device with the most commonly used test to measure stomach emptying, the nuclear medicine gastric emptying scan (also called gastric scintigraphy).

Inclusion Criteria:

• Referred to the nuclear medicine department for a scintigraphic gastric emptying scan.

Exclusion Criteria:

• Have had prior gastric or esophageal surgery.
• Have had surgery to the GI tract within the last 60 days (e.g., appendectomy, cholecystectomy).
• Are on chronic opioids or other medications known to affect gastric emptying (e.g., GLP-1 agonists, high dose tricyclic agents).
• Have been recently hospitalized for complications of diabetes or have a HgbA1c > 10.
• Have severe psychological distress preventing study participation.
• Unable to read or understand the consent form.