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The total blood volume of an individual is approximately

  • A.50 ml/Kg body weight
  • B.60 ml/Kg body weight
  • C.90 ml/Kg body weight
  • D.80 ml/Kg body weight 

Answer: D

Correct answer: 80 ml/Kg body weight

Blood volume is roughly 80 ml per kilogram in an adult, so a 70 kg person has about 5.6 litres - some 7-8% of body weight. Infants have proportionately more, about 85-90 ml/kg. The figure matters in judging how much blood loss a patient can tolerate.

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