↔️ Arteriovenous O₂ Content Difference
UseWhen to use: shock / oxygen-supply assessment with arterial and venous contents or sats.
StrataWidened difference → higher extraction or lower delivery cues.
LimitsWhen not to use: unreliable venous sat. · Pitfall: ScvO₂ ≠ SvO₂. · Pair with flow/DO₂.
SourceStandard arteriovenous O₂ content difference
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
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Methodology · worked example, guidelines & full notes
Ca−Cv.
When to use
When to use: shock / oxygen-supply assessment with arterial and venous contents or sats.
How it works
a−v O₂ = CaO₂ − CvO₂.
Key points
- Ca−Cv.
- Shows O₂ER.
- Next: DO₂/VO₂.
References
- Standard arteriovenous O₂ content difference
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Input mode | Direct contents (mL/dL) |
|---|---|
| CaO₂ | 18 mL/dL |
| CvO₂ | 14 mL/dL |
| Haemoglobin | 12 g/dL |
| SaO₂ | 98 % |
| SvO₂ / ScvO₂ | 70 % |
| PaO₂ (optional) | 90 mmHg |
| PvO₂ (optional) | 40 mmHg |
→a−v O₂ diff4.00mL/dL
- CaO₂：18.00
- CvO₂：14.00
- O₂ER：22.2%
| Input mode | Hb + sats/PO₂ |
|---|---|
| CaO₂ | 18 mL/dL |
| CvO₂ | 14 mL/dL |
| Haemoglobin | 12 g/dL |
| SaO₂ | 98 % |
| SvO₂ / ScvO₂ | 70 % |
| PaO₂ (optional) | 90 mmHg |
| PvO₂ (optional) | 40 mmHg |
→a−v O₂ diff4.66mL/dL
- CaO₂：16.04
- CvO₂：11.38
- O₂ER：29.0%
Verification & sources · governance
FAQ
Frequently asked questions
- Does Arteriovenous O₂ Content Difference upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is Arteriovenous O₂ Content Difference calculated in practice? Can you show a worked example?
- Inputs: Input mode Direct contents (mL/dL), CaO₂ 18 mL/dL, CvO₂ 14 mL/dL, Haemoglobin 12 g/dL, SaO₂ 98 %, SvO₂ / ScvO₂ 70 %, PaO₂ (optional) 90 mmHg, PvO₂ (optional) 40 mmHg → Result: a−v O₂ diff 4.00 mL/dL（CaO₂: 18.00, CvO₂: 14.00, O₂ER: 22.2%） Inputs: Input mode Hb + sats/PO₂, CaO₂ 18 mL/dL, CvO₂ 14 mL/dL, Haemoglobin 12 g/dL, SaO₂ 98 %, SvO₂ / ScvO₂ 70 %, PaO₂ (optional) 90 mmHg, PvO₂ (optional) 40 mmHg → Result: a−v O₂ diff 4.66 mL/dL（CaO₂: 16.04, CvO₂: 11.38, O₂ER: 29.0%）