Table 1. The measured absolute blood SO2 from three different PA modes.
| Blood sample | Blood gas analyzer SO2 (%) | Two-wavelength single-ended PA with error % | Two-wavelength differential PA with error %a |
Three-wavelength differential PA with error % |
|---|---|---|---|---|
| 1 | 93 | 93 (ref.) | 93 (ref.) – 93 (ref.) | 93 (ref.) |
| 2 | 86.5 | 85.74 (0.87) | 86.75 (0.29) – 87.22 (0.83) | 85.63 (1.00) |
| 3 | 82.3 | 79.73 (3.13) | 79.55 (3.34) – 80.57 (2.10) | 78.86 (4.18) |
| 4 | 72.8 | 71.07 (2.38) | 71.06 (2.39) – 72.72 (0.11) | 70.14 (3.65) |
| 5 | 62.2 | 64.86 (4.28) | 60.94 (2.03) – 63.36 (1.86) | 62.2 (ref.) |
a
CHb values of 93% SO2 and 62.2% SO2 blood samples (1.923 mM and 2.070 mM, respectively) were used to obtain the range of the estimated absolute SO2 that consider the possible local CHb variation.