Final answer:
The safest and most comfortable position for NG tube insertion is the High Fowler's position, although the supine position could be used as well, depending on the specific circumstances.
Step-by-step explanation:
The safest and most comfortable position for NG tube insertion is the High Fowler's position. In this position, the patient is seated with the backrest of the bed elevated to an angle between 60 to 90 degrees. This posture facilitates easy access to the nasal passage and helps prevent potential complications such as aspiration. The supine position, which involves lying flat on the back, may also be used depending on the specific circumstances and patient condition, but it is not the primary choice for NG tube placement. In contrast, the prone position places a person face down, and the left lateral position involves lying on the left side, neither of which are ideal for NG tube insertion.