You can stop CPR when one of four conditions is met: signs of life return, you become too tired to continue, someone equally or more qualified takes over, or a doctor pronounces death. CPR instructors teach this as the STOP acronym: Signs of life, Too tired, Other qualified rescuer, Pronounced dead, and it’s the rule you’ll learn in any certified class. There’s also a fifth, implicit rule: stop if the scene becomes unsafe and continuing would put you at risk. Here’s the breakdown.
The STOP acronym at a glance
| Letter | Stands for | When this means stop |
|---|---|---|
| S | Signs of life return | The person breathes, moves, or yells at you to stop. They still need medical attention, but compressions are no longer needed. |
| T | Too tired to continue | Effective compressions are physically exhausting. Stop if you can no longer perform quality CPR and no one can take over for you. |
| O | Other qualified rescuer takes over | Someone equally or more trained arrives, takes responsibility, and starts compressions. Be ready to switch back if they get tired. |
| P | Pronounced dead by a doctor | Only a doctor can officially declare death. This typically only happens at a hospital, not in the field. |
S — Signs of Life Return
If someone begins to yell at you to get off their chest, or that you’re hurting them, it’s pretty clear they no longer need CPR. By no means does that mean they don’t need medical attention, but compressions and breaths are no longer needed. Make sure the victim goes to the hospital, but you don’t have to continue care.
T — Too Tired to Continue
CPR is hard work. If you’ve ever taken a class or performed CPR in the field, you know it takes real energy. Adrenaline will help, but you can’t keep going forever. If you’re too tired to continue and there’s no one to take over, you’re allowed to stop.
O — Other Qualified Rescuer Takes Over
If someone equally or more qualified than you offers help, you can stop CPR to let them take over. If the person offering help has no idea what they’re doing, reconsider whether they’re the right fit. When a qualified rescuer steps in, be ready to start again once they get tired, switching shifts back and forth until Emergency Medical Services arrive.
P — Pronounced Dead
You may believe someone is dead, and if you’re doing CPR, you’re correct in the sense that they have no heartbeat and aren’t breathing. But the only person who can officially pronounce time of death is a doctor, which is why this almost always happens at a hospital, not on the scene. Until that point, you continue care or hand off to someone qualified.
The Fifth Rule: When the Scene Becomes Unsafe
The STOP acronym covers four conditions, but there’s a fifth that every CPR class teaches as a separate rule: stop if the scene becomes unsafe. Fire, traffic, an unstable structure, a violent person, if continuing would make you a second victim, get to safety. It’s better to have one victim than two.
This is also why every CPR class starts with “scene safety” before any compressions are taught. You can’t help anyone if you become a casualty yourself.
California’s Good Samaritan Law and Stopping CPR
California’s Good Samaritan Law (Health & Safety Code §1799.102) protects bystanders who provide emergency care in good faith. The law requires that once you begin care, you continue until one of the STOP conditions is met or until EMS takes over. Stopping for any reason outside those conditions doesn’t automatically mean a lawsuit, but it can complicate your legal protection. The four STOP conditions, plus scene safety, are guaranteed exceptions.
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