During chest compressions, what is the minimum depth required?

• A. 2 Inches
• B. 1 Inch
• C. 3 Inches
• D. 4 Inches

Answer: (A)

The essential point is that chest compressions must depress the chest enough to push blood out of the heart; this requires a depth of at least 2 inches (about 5 cm). Hitting this depth creates enough intrathoracic pressure to generate a meaningful blood flow with each compression, which is critical for delivering oxygen to the brain and other vital organs during CPR. Compressions shall be firm and allow full chest recoil between pushes, so the heart can fill again for the next cycle. If you compress only 1 inch, blood flow is insufficient, reducing the effectiveness of resuscitation. Compressing deeper (around 3–4 inches) isn’t required as a minimum and carries a higher risk of injury if done with improper technique, though aiming for roughly 2 inches (up to about 2.4 inches) generally balances effectiveness with safety.