Phlebotomy Technician Practice Exam (NCPT/CPT)

How much of plasma is H2O?

1. 90%

2. 75%

3. 80%

4. 60%

The correct answer is: 90%

Plasma is the liquid component of blood and it makes up about 55% of total blood volume. It mostly consists of water, with around 90% of plasma consisting of H2O. This means that out of all the options, A (90%) is the most accurate answer. B, C, and D are incorrect options as they are lower percentages and do not accurately reflect the high water content of plasma. It is important to note that while plasma mainly consists of water, it also contains other substances such as proteins, ions, and antibodies that play important roles in various bodily functions.