How deep should chest compressions be for an adult?

How deep should chest compressions be for an adult?

• A. Interlock hands, compress about 1 inch (2.5 cm) deep.
• B. Interlock hands, compress about 1.5 inches (4 cm) deep.
• C. Interlock hands, compress about 2.5 inches (6 cm) deep.
• D. Interlock hands, compress about 2 inches (5 cm) deep.

Answer: (D)

Depth of chest compressions determines how effectively blood is moved with each pump. For an adult, aim for about 2 inches (5 cm) of compression. This depth provides enough pressure to push blood through the circulatory system while still allowing the chest to recoil fully between compressions. Shallow compressions, like 1 inch or 1.5 inches, don’t generate sufficient blood flow. Going beyond roughly 2.4 inches (6 cm) increases injury risk without added benefit. So 2 inches (5 cm) is the standard target, paired with a steady rate and full recoil to maximize CPR effectiveness.

Depth of chest compressions determines how effectively blood is moved with each pump. For an adult, aim for about 2 inches (5 cm) of compression. This depth provides enough pressure to push blood through the circulatory system while still allowing the chest to recoil fully between compressions. Shallow compressions, like 1 inch or 1.5 inches, don’t generate sufficient blood flow. Going beyond roughly 2.4 inches (6 cm) increases injury risk without added benefit. So 2 inches (5 cm) is the standard target, paired with a steady rate and full recoil to maximize CPR effectiveness.