The maximum fluid capacity for a single humerus or tibia fracture is approximately?

• A. 750 mL
• B. 1500 mL
• C. 250 mL
• D. 100 mL

Answer: (A)

When assessing a limb fracture, it’s important to estimate how much blood can pool within the injured area before pressure builds up and tissues start to suffer. A long bone fracture in the arm (humerus) or leg (tibia) can trap a substantial amount of blood in the surrounding soft tissues. The typical maximum capacity for that space is about 750 mL. This figure helps you anticipate potential blood loss, monitor for signs of shock, and decide how quickly to transport and manage the injury to minimize further complications.

The other numbers aren’t as consistent with what a single fractured humerus or tibia would hold: around 100 or 250 mL underestimates the space available, while 1500 mL is more than a single limb injury usually contains unless there are other injuries or a much larger bleed. Keep in mind actual blood loss varies with the fracture pattern, person’s size, and other injuries, but 750 mL is the standard reference for estimating potential limb hemorrhage in this context.