Estimated total blood volume for a 70 kg adult is approximately?

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Multiple Choice

Estimated total blood volume for a 70 kg adult is approximately?

Explanation:
Blood volume in adults is commonly estimated at about 70 mL per kilogram of body weight, roughly 7–8% of body weight. For a 70 kg person, that’s 70 kg × 70 mL/kg = 4900 mL, or about 4.9 liters. This is the standard approximation used in clinical practice, making 4.9 L the best fit. The other options correspond to values that would imply notably different per-kilogram estimates and are not consistent with the common rule of 70 mL/kg.

Blood volume in adults is commonly estimated at about 70 mL per kilogram of body weight, roughly 7–8% of body weight. For a 70 kg person, that’s 70 kg × 70 mL/kg = 4900 mL, or about 4.9 liters. This is the standard approximation used in clinical practice, making 4.9 L the best fit. The other options correspond to values that would imply notably different per-kilogram estimates and are not consistent with the common rule of 70 mL/kg.

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