What percentage of a newborn's total blood volume does a 10ml blood sample represent?

To determine what percentage a 10ml blood sample represents of a newborn's total blood volume, it's important to know the average total blood volume of a newborn. Typically, a newborn has about 85 to 90 ml of blood per kilogram of body weight. For an average newborn weighing approximately 3.5 kg, the total blood volume would be around 300 to 350 ml.

Using a commonly accepted approximate total blood volume of 300 ml allows for a straightforward calculation. The formula for percentage is:

[ \text{Percentage} = \left( \frac{\text{sample volume}}{\text{total blood volume}} \right) \times 100 ]

If we use 300 ml as the total blood volume:

[ \text{Percentage} = \left( \frac{10 \text{ ml}}{300 \text{ ml}} \right) \times 100 = \frac{10}{300} \times 100 = \frac{1}{30} \times 100 \approx 3.33% ]

However, the options provided seem to assume a different total blood volume for newborns. It's important to check the context provided in the question to confirm which total blood volume they refer