The depth range for adult chest compressions in CPR is between which values?

• A. 0.5 To 1 Inch
• B. 1-1/2 To 2 Inches
• C. 2 To 3 Inches
• D. 3 To 4 Inches

Answer: (B)

The main idea is compressing the chest enough to push blood out of the heart with each push, without causing unnecessary injury. For an adult, aiming for about 1.5 to 2 inches (roughly 5 cm) of depth with each compression gives enough force to generate blood flow while keeping the risk of serious chest injuries low. If the compressions are too shallow, like 0.5 to 1 inch, they won’t move enough blood to maintain circulation. Going deeper than the recommended range, toward 2.5 to 3 inches or more, increases the chance of rib fractures or internal injury, especially with repeated compressions. So the 1.5 to 2 inch depth is the best balance for effective, safe chest compressions in adults.