The plasma volume calculator works out plasma volume for females and plasma volume for males from height, hematocrit and weight. Enter what you have and the relationship is applied straight away, so you get the answer without working through the algebra yourself.
What Is the Plasma Volume Calculator?
The plasma volume calculator gives you an estimate of plasma volume for females and plasma volume for males based on height, hematocrit and weight.
It is a quick reference figure rather than a diagnosis, and it is most useful for tracking how a number moves over time rather than for interpreting a single reading.
How the Plasma Volume Estimate Is Worked Out
The calculation follows published reference relationships, so it is a reasonable approximation when the inputs are accurate. It assumes an average adult and does not account for individual variation.
If you are comparing two people, or the same person over a period of weeks, keep the method and the inputs identical. A change in the method can easily look like a change in the person.
What This Calculator Does Not Do
It does not diagnose anything, and it does not replace advice from a clinician. If a figure comes out at an extreme, or if it differs sharply from what you expect, that is a reason to speak to a professional rather than to adjust the inputs.
Nothing you type here is stored or sent anywhere. The whole calculation happens in your browser.
A Worked Example
Working through an example, with height set to 10, hematocrit set to 5, weight set to 2, the calculator returns plasma volume for males of -560, and plasma volume for females of -520, and plasma volume for males (plasma volume males nadlers) of -1,470.274. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out plasma volume for females?
Enter height, hematocrit and weight. The calculator then works through the relationship and reports plasma volume for females and plasma volume for males.
What does the plasma volume actually calculate?
It takes height, hematocrit and weight and converts them into plasma volume for females and plasma volume for males using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter height?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Is the answer exact?
It is as exact as the formula and the inputs allow. The method itself is the standard one for this problem, so the only sources of error are the figures you enter and the precision you ask for.
Do I have to fill in every field?
Only the fields a particular result depends on. If you leave one blank, the results that need it simply show a note instead of a number, and everything else still works.