What percentage of a patient's blood volume is equivalent to 1,500 ml?

To determine what percentage of a patient's blood volume is equivalent to 1,500 ml, one must first consider typical blood volumes in adults. An average adult has a blood volume of about 5 to 6 liters, which translates to 5,000 to 6,000 ml.

Calculating the fraction that 1,500 ml represents of the average total blood volume leads to the following understanding:

If we take the average blood volume of, say, 5,000 ml for ease of calculation: 1,500 ml is a portion of this volume. To find the percentage, you can set up the following calculation:

(1,500 ml / 5,000 ml) * 100 = 30%

This indicates that 1,500 ml is equivalent to 30% of 5,000 ml. When you convert 30% into a fraction, it closely approximates 1/3.

Therefore, the choice that corresponds to 1/3 of a patient's blood volume accurately reflects what percentage 1,500 ml represents of typical blood volumes for an adult. This is why that answer is correct.