Estimate blood volume from weight using an age-group-specific volume factor.
Pediatric Blood Volume Calculator
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Results
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Table of Contents
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What is Pediatric Blood Volume?
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How to Use This Calculator
- Enter or select Weight, Age group.
- 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
Estimated volume = weight(kg) × selected mL/kg factor.
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Variables Explained
| Input | What it means |
|---|---|
| Weight | Measured mass in the chosen unit; pounds and kilograms are not numerically interchangeable. |
| Age group | Age in the time unit shown; most adult equations use completed years. |
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Worked Example
A hypothetical 10 kg patient with an 80 mL/kg factor has estimated blood volume of 800 mL.
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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
- Age, physiology and illness affect the estimate; the value does not set a transfusion threshold.
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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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