Final answer:
Advanced life support should be called when a patient's airway is compromised, as this can lead to life-threatening oxygen deprivation.
Step-by-step explanation:
When considering calling for advanced life support, a key factor is whether the patient's airway is compromised. This means that if the patient is having difficulty breathing or is unable to breathe, advanced life support should be called. This is important because an impaired airway can lead to oxygen deprivation and can quickly become life-threatening.