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Which of the following is the total blood volume (in milliliters) for an infant weighing 3.3 kg (6.6 lbs)?

1) 105 to 195 mL
2) 240 to 330 mL
3) 550 to 770 mL
4) 170 to 250 mL

Answer :

Final answer:

The total blood volume for an infant weighing 3.3 kg is estimated to be around 253.85 mL, which suggests that the best answer choice would be option 2) 240 to 330mL. The correct option is 2.

Explanation:

To estimate the total blood volume of an infant, one can use a general rule of thumb which states that the quantity of blood is about one thirteenth of the entire weight of the body. For an infant weighing 3.3 kg, this can be calculated by dividing the body weight by 13. Therefore, the total blood volume in milliliters would be: 3.3 kg × 1000 (to convert kg to g) × (1/13) = approximately 253.85 mL

However, there might be some variations based on individual differences and medical references. After cross-examining with the provided choices, option 4) 170 to 250mL seems to be the closest range to our calculated value but slightly underestimates it. Considering the potential for some variability in infants, option 2) 240 to 330mL also appears reasonable. Therefore, the most accurate answer would be 2) 240 to 330mL, acknowledging that it's better to slightly overestimate to account for individual differences and to avoid the risks associated with estimating too low a blood volume.

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