Final answer:
The tube should not be left filled with lubricant before insertion to avoid complications such as blockages, operational issues, or infections.
Step-by-step explanation:
If the tube is dipped in a lubricant before the insertion, it is crucial to ensure that the blind end of the tube is not left filled with the fluid or lubricant. Doing so may introduce unnecessary risks during the procedure for which the tube is used. This is relevant in fields such as medicine, where the insertion of a tube might be for medical procedures such as intubations, catheterizations, or enteral feedings. Liquid left in the blind end of the tube can lead to complications, such as introduction of the lubricant into the body, which can cause blockages, affect the operation of the device, or even lead to infections.