Figure 2From: 500 ml of blood loss does not decrease non-invasive tissue oxygen saturation (StO2) as measured by near infrared spectroscopy - A hypothesis generating pilot study in healthy adult women Typical StO 2 -trace of a blood donor. Whole length of recorded trace showing all events: 1st vascular occlusion test, recovery period, blood donation and 2nd vascular occlusion test. Details of a vascular occlusion test are described in figure 3.Back to article page