Estimate blood pH from bicarbonate and carbon-dioxide partial pressure using Henderson–Hasselbalch.
Venous Blood pH Calculator
Form
Results
Venous blood pH
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Table of Contents
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What is Venous Blood pH?
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How to Use This Calculator
- Enter or select Bicarbonate (HCO₃), PaCO₂.
- 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
pH = 6.1+log₁₀(HCO₃/(0.03 × PCO₂))
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Variables Explained
| Input | What it means |
|---|---|
| Bicarbonate (HCO₃) | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
| PaCO₂ | Use the observed finding or laboratory value for this criterion, following the definition shown in the form. |
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Worked Example
Bicarbonate 24 mmol/L and PCO₂ 40 mmHg give pH≈7.40.
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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
- Match the specimen and units; a calculated result does not replace a measured blood gas.
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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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