The same needle can then be used as a "sounding" needle to ensure a safe tract for PEG tube placement. This is completed by passing this needle from the abdominal wall into the stomach (confirmed by endoscopic visualization) and noting its angle of entry. After this needle passes through the skin, continuous suction should be maintained on it; if air bubbles are seen in the syringe before the needle enters inside the stomach, as assessed endoscopically, it may have entered the colon. If this happens, another entry tract should be sought.