Which statement best defines an unstable patient?

• A. A patient with minor injuries
• B. A patient whose vitals are normal
• C. A patient with chronic illness but stable
• D. Any life threatening condition cannot be controlled or threatens to reoccur, or a depressed level of responsiveness

Answer: (D)

Unstable means the patient is at immediate risk to life or is not able to maintain basic functions, with a condition that cannot be controlled or is likely to worsen, and often accompanied by a depressed level of responsiveness.

This definition centers on threats to life and the potential for rapid deterioration. For example, a life-threatening condition that can’t be controlled right now, or one that may recur soon, signals instability and requires urgent assessment and rapid transport. A diminished level of consciousness also indicates compromised brain perfusion or injury, which is another clear sign of instability.

In contrast, someone with minor injuries, normal vitals, or a chronic illness that is currently stable does not fit that sense of immediate danger or risk of rapid decline. Those scenarios describe stability rather than instability, even though symptoms or conditions may still require care.