Hemodynamics & Oxygen Delivery
Mixed Venous Oxygen Saturation (SvO₂) Calculator & Practice Cases
Use this interactive SvO₂ calculator to estimate mixed venous oxygen saturation from hemoglobin, arterial oxygenation, cardiac output, and oxygen consumption. Then switch into practice mode to build intuition for shock states, anemia, sedation, oxygen delivery, and tissue extraction.
This tool pairs well with our ABG Analyzer, Fick Cardiac Output Calculator, Causes of Hypoxemia guide, and P/F Ratio guide.
Why SvO₂ matters
SvO₂ helps you assess whether oxygen delivery is keeping up with oxygen consumption. It is a high-yield concept in shock, sepsis, anemia, cardiogenic failure, and critical care transport.
Best use case
Use real values mode for bedside teaching and fast physiology checks. Use practice mode to drill pattern recognition across high-yield scenarios.
Related study path
After mastering SvO₂, reinforce oxygenation and gas exchange with the A–a Gradient guide and ABG Analysis guide.
How to interpret SvO₂ in context
Low SvO₂
Usually means tissues are extracting more oxygen because delivery is inadequate or metabolic demand is high. Think low cardiac output, blood loss, hypoxemia, agitation, fever, or worsening shock.
High SvO₂
Can reflect strong delivery, but may also mean impaired extraction. In sepsis, microcirculatory shunting and mitochondrial dysfunction can produce a falsely reassuring high SvO₂.
For a deeper CO-based framework, use our Fick calculator and compare with the oxygenation tools.