There are three main methods to determine that the gastric tube is in the stomach: extraction of gastric fluid method, gas-over-water sound method, and air bubble method.
1. Extraction of gastric fluid method: take a sterile syringe and extract gastric fluid at the end of the gastric tube, that is, at the end of the oral cavity, and then extract the gastric fluid for visual observation and biochemical testing, and then determine that the gastric tube is in the stomach if the extracted gastric fluid is clear.
2. Air-over-water method: place the stethoscope in the left upper abdomen of the stomach, take a sterile syringe and inject about 10ml of air from the gastric tube, at this time, you can hear the sound of air-over-water through the stethoscope, and then it can be confirmed that the gastric tube is in the stomach.
3. Bubble method: put the end of the gastric tube into a container with water, the water should not be over the gastric tube, at this time, bubbles can be seen in the container, it can be confirmed that the gastric tube is in the stomach.
The above operations should be carried out by a professional doctor and should not be used without authorization.