What does "Gastric lumen" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
The gastric lumen is the inside space of the stomach. It's where the food you eat goes after you swallow it. The stomach then uses acids and enzymes in this space to break down the food into a form your body can use. So, you can think of the gastric lumen as the main room in a food processing plant.
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