The average adult body contains how many liters of blood?

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Study for the NHCO Phlebotomy Test. Experience flashcards and multiple-choice questions with hints and explanations. Prepare effectively for your phlebotomy exam!

Multiple Choice

The average adult body contains how many liters of blood?

Explanation:
Blood volume scales with body size, and in an average adult it sits around 5 to 7 liters. This roughly corresponds to about 7–8% of body weight, so a person around 70 kg typically carries about 5–6 liters of blood. That’s why the standard range used in exams is 5–7 liters—it captures the normal variation among typical adults. The other ranges are outside what’s usual for a healthy adult: 3–4 liters and 1–2 liters are below normal, while 7–9 liters would be higher than average and seen only in unusually large individuals or certain conditions.

Blood volume scales with body size, and in an average adult it sits around 5 to 7 liters. This roughly corresponds to about 7–8% of body weight, so a person around 70 kg typically carries about 5–6 liters of blood. That’s why the standard range used in exams is 5–7 liters—it captures the normal variation among typical adults. The other ranges are outside what’s usual for a healthy adult: 3–4 liters and 1–2 liters are below normal, while 7–9 liters would be higher than average and seen only in unusually large individuals or certain conditions.

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