How do you check gastric residual in nasogastric tube?

To check gastric residual in a nasogastric tube, first ensure that the patient is in a semi-upright position for safety. Use a syringe to gently aspirate a small amount of gastric contents from the tube, checking for color and consistency. Measure the volume of the aspirated contents, and if significant residual is present (usually defined as more than 250 mL, but this can vary by protocol), consult relevant guidelines or a healthcare provider before administering further feedings. Always remember to document your findings.