What is the normal SvO2 value range?

What is the normal SvO2 value range?

• A. 60-70%
• B. 70-80%
• C. 80-90%
• D. 95-100%

Answer: (B)

SvO2 is the mixed venous oxygen saturation and reflects the balance between oxygen delivery to tissues and their oxygen consumption. In a healthy state, tissues extract roughly a quarter of the delivered O2, leaving about three-quarters in the mixed venous blood. This places normal SvO2 in the broad range of roughly 60–80%, with many clinicians citing about 65–75% and often using 70–80% as a practical target. Among common answer choices, 70–80% best matches this normal window. If SvO2 drops below this range, it suggests higher oxygen extraction or reduced delivery (for example, anemia, low cardiac output, or hypoperfusion). If SvO2 rises above this range, it can indicate reduced tissue utilization or conditions with high oxygen delivery relative to demand (such as certain septic states or mitochondrial dysfunction).

SvO2 is the mixed venous oxygen saturation and reflects the balance between oxygen delivery to tissues and their oxygen consumption. In a healthy state, tissues extract roughly a quarter of the delivered O2, leaving about three-quarters in the mixed venous blood. This places normal SvO2 in the broad range of roughly 60–80%, with many clinicians citing about 65–75% and often using 70–80% as a practical target. Among common answer choices, 70–80% best matches this normal window.

If SvO2 drops below this range, it suggests higher oxygen extraction or reduced delivery (for example, anemia, low cardiac output, or hypoperfusion). If SvO2 rises above this range, it can indicate reduced tissue utilization or conditions with high oxygen delivery relative to demand (such as certain septic states or mitochondrial dysfunction).