A 13-year-old has approximately 2925-3150 mL of blood volume.
Adolescents have approximately 70 mL/kg (males) or 65 mL/kg (females) of blood volume. As statistically, 13-year old weights about 100 lbs (~45 kg), the average blood volume for adolescents will be 3150 mL for males and 2925 mL for females. Read more