A young adult is brought to the emergency department after taking a handful of drugs. The client is unresponsive, so an endotracheal tube (ETT) is inserted. How should the nurse determine if the ETT is correctly placed? Select all that apply.

A. Obtaining a portable chest x-ray is the gold standard for confirming ETT placement, ensuring the tube is positioned correctly in the trachea and not in the esophagus. B. Assessing for symmetrical chest movement is important; asymmetry may indicate improper tube placement or lung involvement. C. Monitoring ETT markings can provide some information about placement, but it is not a definitive method for verifying correct placement since individual anatomy can vary. D. Auscultating for bilateral breath sounds confirms that air is reaching both lungs, indicating proper ETT placement. E. Checking capillary refill does not assess ETT placement and is not relevant in this context; the focus should be on respiratory status and tube positioning.