Q: Frank cyanosis of a patient generally corresponds to what level of arterial oxygen saturation (SaO2)?
Answer: 67 percent
The oxygen saturation level at which patient becomes apparently cyanotic depends on many factors like tissue perfusion, skin color, or hemoglobin concentration, but at least one study showed that apparent cyanosis of patient corresponds to massive hypoxemia of 67 % 1.
#oxygenation
Reference:
1. Grace RF. Pulse oximetry. Gold standard or false sense of security? Med J Aust 1994; 160:638.
2. Hanning CD, Alexander-Williams JM. Pulse oximetry: a practical review. BMJ 1995; 311:367.
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