Blood Oxygen Content Calculator (CaO₂ / CvO₂)

Blood Oxygen Content Calculator (CaO₂ / CvO₂) | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Health
Input types: number
Output type: json
Sample coverage: 4
API ready: Yes

Overview

The Blood Oxygen Content Calculator estimates arterial oxygen content (CaO₂) from hemoglobin, arterial oxygen saturation, and PaO₂. When mixed-venous values and cardiac output are provided, it also calculates CvO₂, the arterial–venous oxygen difference, extraction ratio, oxygen delivery (DO₂), and oxygen consumption (VO₂). This calculator is for reference and is not medical advice.

When to use

Estimate arterial oxygen content from hemoglobin, SaO₂, and PaO₂ values.
Compare arterial and mixed-venous oxygen content using SvO₂ and PvO₂.
Calculate oxygen delivery and consumption when cardiac output is available.

How it works

1Enter hemoglobin in g/dL, arterial oxygen saturation as a fraction from 0 to 1, and PaO₂ in mmHg.
2The calculator applies CaO₂ = 1.34 × Hb × SaO₂ + 0.003 × PaO₂ and reports bound, dissolved, and total oxygen.
3Optionally enter SvO₂ and PvO₂ to calculate CvO₂, the a-v oxygen difference, and the extraction ratio.
4Add cardiac output in L/min to calculate DO₂ and VO₂, with results rounded to the selected decimal places.

Use cases

Review arterial oxygen content when assessing the effects of hemoglobin, saturation, and PaO₂.
Study oxygen extraction by comparing CaO₂ with CvO₂ from mixed-venous measurements.
Estimate oxygen delivery and consumption for critical care calculations when cardiac output is known.

Examples

1. Normal arterial oxygen content

Medical student

Background

A student wants to verify the contribution of hemoglobin-bound and dissolved oxygen in a typical arterial blood sample.

Problem

Calculate CaO₂ from Hb 15 g/dL, SaO₂ 0.97, and PaO₂ 100 mmHg.

How to use

Enter 15 for hemoglobin, 0.97 for SaO₂, 100 for PaO₂, and select 2 decimal places.

Hb = 15 g/dL; SaO₂ = 0.97; PaO₂ = 100 mmHg; decimal places = 2

Outcome

The calculator returns CaO₂ ≈ 19.80 mL O₂/dL, including 19.50 mL/dL bound oxygen and 0.30 mL/dL dissolved oxygen.

2. Full oxygen delivery calculation

Critical care trainee

Background

A trainee is reviewing arterial and mixed-venous measurements alongside cardiac output.

Problem

Calculate CaO₂, CvO₂, the a-v oxygen difference, extraction ratio, DO₂, and VO₂.

How to use

Enter Hb 12 g/dL, SaO₂ 0.92, PaO₂ 60 mmHg, SvO₂ 0.70, PvO₂ 35 mmHg, and cardiac output 4.5 L/min.

FAQ

What does CaO₂ mean?

CaO₂ is arterial blood oxygen content, reported in mL O₂/dL.

What units should I use for SaO₂ and SvO₂?

Enter oxygen saturation as a fraction from 0 to 1, such as 0.97 for 97%.

Are mixed-venous inputs required?

No. Hemoglobin, SaO₂, and PaO₂ are sufficient for CaO₂. SvO₂ and PvO₂ are optional.

What does the cardiac output input calculate?

With the required mixed-venous values, cardiac output enables calculations for DO₂ and VO₂.

Is this calculator medical advice?

No. It provides formula-based estimates and should not replace clinical assessment or professional medical advice.

Hb = 12 g/dL; SaO₂ = 0.92; PaO₂ = 60 mmHg; SvO₂ = 0.70; PvO₂ = 35 mmHg; CO = 4.5 L/min; decimal places = 2

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Normal arterial oxygen content

2. Full oxygen delivery calculation

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