What is the average adult blood volume per kilogram?

Study for the Paramedic Aandamp;P Exam. Engage with flashcards and multiple choice questions, complete with hints and explanations. Prepare effectively for your exam!

Multiple Choice

What is the average adult blood volume per kilogram?

In adults, blood volume is typically estimated at about 70 mL per kilogram. This stems from the common rule of thumb that a person around 70 kg has roughly 5 liters of blood (70 kg × 70 mL/kg ≈ 4900 mL, about 5 L), which is why 70 mL/kg is the standard figure. It also aligns with blood being about 7–8% of body weight in a healthy adult. If you used 60 mL/kg, you’d expect about 4.2 L for a 70 kg person—lower than the usual adult range. Using 80 or 90 mL/kg would imply 5.6–6.3 L, higher than the typical average. So 70 mL/kg best reflects the common adult value used for estimating blood volume and guiding fluid management.

In adults, blood volume is typically estimated at about 70 mL per kilogram. This stems from the common rule of thumb that a person around 70 kg has roughly 5 liters of blood (70 kg × 70 mL/kg ≈ 4900 mL, about 5 L), which is why 70 mL/kg is the standard figure. It also aligns with blood being about 7–8% of body weight in a healthy adult. If you used 60 mL/kg, you’d expect about 4.2 L for a 70 kg person—lower than the usual adult range. Using 80 or 90 mL/kg would imply 5.6–6.3 L, higher than the typical average. So 70 mL/kg best reflects the common adult value used for estimating blood volume and guiding fluid management.

More practice questions