Which of the following intraosseous sites requires Base Hospital contact?

The correct answer is the antero-distal femur, 2 cm above the patella, as this intraosseous site typically requires Base Hospital contact due to specific protocols and considerations surrounding its use. The femur is a larger bone and accessing it for intraosseous infusion can be more complex, depending on the scenario.

Intraosseous access in pediatric or certain patient populations may have additional guidelines, and the femoral site is often reserved for more critical situations where rapid access is necessary. It is imperative to follow local protocols that usually dictate that any advanced invasive procedures, particularly those involving larger bones, need authorization or medical direction.

Other sites, such as the proximal humerus, antero-distal tibia, and posterior iliac crest, may allow for intraosseous access under certain conditions without requiring Base Hospital contact, as they are often more utilized in routine scenarios or have established guidelines for use in emergencies where immediate intervention is needed without medical control.