American Red Cross CPR Practice Test 2026 – Comprehensive Exam Prep

Chest compressions for adults should be at least 2 inches deep. This depth is necessary to ensure that adequate blood flow is generated to the heart and brain during CPR. The 2-inch depth is based on the anatomy of the adult chest, allowing for effective compression of the heart and sufficient pressure to circulate blood.

Compressions that are too shallow may not produce the necessary blood flow, which can significantly diminish the chances of survival in a cardiac emergency. The recommendation for 2 inches aligns with guidelines from organizations like the American Heart Association, which aim to standardize CPR practices for optimal effectiveness. Ensuring proper depth, along with proper rate and allowing for complete chest recoil between compressions, contributes to the overall efficacy of CPR.