Tactical Combat Casualty Care (TCCC) Tier 3 Practice Exam 2026 - Free TCCC Tier 3 Practice Questions and Study Guide

The flow rate for humeral intraosseous (IO) access is generally understood to be approximately 100 to 120 ml/min. This flow rate is important because the humeral IO site provides rapid access to the vascular system, which is critical in emergency situations when intravenous access may be challenging.

The correct flow rate of 105 ml/min reflects optimal performance of the humeral IO access, allowing for effective medication delivery and fluid resuscitation during trauma scenarios. This flow rate capability aids in maintaining optimal circulation, which is essential for patient survival in time-sensitive situations.

In summary, the chosen flow rate of 105 ml/min is based on established protocols that highlight the efficacy and rapidity of drug administration through this route, ensuring that healthcare providers can act swiftly when managing critically injured patients.