This document provides instructions for nasogastric tube insertion. It defines nasogastric tube insertion as introducing a tube into the stomach for therapeutic or diagnostic purposes. It describes the indications, equipment needed, preparation of the patient and unit, step-by-step procedure, recording/reporting, and methods to check tube placement including auscultation, aspirating gastric contents, and testing pH of aspirated fluid. The goal is to properly place the tube in the stomach to provide artificial feeding, administer oral medications or perform other procedures while ensuring patient safety and comfort.