Pulse oximetry – a) Locates the isobestic point of hemoglobin and measure oxygen saturationb) Is inaccurate in the presence of fetal hemoglobinc) Is inaccurate in the presence of caboxyhemoglobind) Measures oxygen content
a
bc
ac
b
Pulse oximetry is used to determine :- i) Hb concentration by isobetric points location, and ii) Oxygen saturation (But not oxygen content).
Carboxy-hymoglobin can cause inaccurate reading but not the fetal hemoglobin.