United Airlines First Aid Practice Test 2026 - Free First Aid Practice Questions and Study Guide

When performing CPR on an adult, the goal of chest compressions is to generate enough blood flow with each compression. That relies on a depth that’s deep enough to squeeze the heart and push blood out to the body. The guideline sets a minimum depth: compressions should be at least 2 inches (about 5 cm). This ensures you’re creating meaningful pressure to propel blood through the circulation with each push. If you compress only about 1 inch, the blood flow will be too weak to be effective. Deeper compressions, such as around 2.5 inches or more, can still be within guideline ranges and are sometimes used, but the key point the question tests is the minimum required depth. So the best choice expresses that minimum requirement: at least 2 inches.