Estimate plasma volume from a weight-based blood-volume assumption and hematocrit.
Plasma Volume Calculator
Form
Results
Plasma volume for females
0
Plasma volume for males
0
Table of Contents
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What is Plasma Volume?
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How to Use This Calculator
- Enter or select Weight, Hematocrit.
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
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Formula Used
Plasma volume = estimated blood volume × (1−hematocrit fraction).
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Variables Explained
| Input | What it means |
|---|---|
| Weight | Measured mass in the chosen unit; pounds and kilograms are not numerically interchangeable. |
| Hematocrit | The red-cell share of blood volume; distinguish a percentage from a decimal fraction. |
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Worked Example
Estimated blood volume 5 L and hematocrit 40% imply plasma volume of 3 L.
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Why Use This Calculator?
Use the calculation to make the method and its inputs easier to check with a healthcare professional. Its meaning depends on the clinical setting and on whether the underlying method is appropriate for that person.
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Common Mistakes
- Weight-based blood volume is approximate, and a hematocrit of 40% must be used as 0.40 in the formula.
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Frequently Asked Questions
Is this result a diagnosis or treatment instruction?
No. It describes a calculation or score from the supplied information. A qualified clinician must check the measurements, the method’s applicability and the wider clinical picture.
Can I enter the units from any lab report?
Use the units specified in the form and select a conversion only where the page provides one. Different substances need different conversion factors; a mismatch can produce a plausible but incorrect result.
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Sources & References
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