Final answer:
The use of accessory muscles while breathing can confirm that the patient is not getting sufficient oxygen.
Step-by-step explanation:
The confirmed indication that the patient is not getting sufficient oxygen can be determined by the use of accessory muscles while breathing. When an individual is not getting enough oxygen, the body compensates by recruiting additional muscles, such as the neck and shoulder muscles, to assist with breathing. This is known as the use of accessory muscles during respiration.