What is the ratio of chest compressions to breaths in adult CPR?

• A. 30:2
• B. 15:2
• C. 30:3
• D. 20:2

Answer: (A)

In adult CPR, the emphasis is on delivering a rhythm that keeps blood flowing while you ventilate. The standard pattern is 30 chest compressions followed by 2 rescue breaths, repeated in cycles until help arrives or the person recovers. This 30:2 rhythm is the recommended approach for adults, whether you’re performing CPR solo or with another rescuer. The other options don’t fit adult guidelines: 15:2 is used for children or infants (often with two rescuers), 30:3 would mean an extra breath per cycle which isn’t guideline, and 20:2 isn’t a recognized CPR ratio. Sticking with 30 compressions to 2 breaths balances circulation and ventilation most effectively in adults.