Given the following blood parameters, compute the total O2 content (dissolved + HbO2) of the blood in ml/dl: Hb = 16; PO2 = 625 Hg; SO2 = 100%
a. 17.8 ml/dl
b. 19.4 ml/dl
c. 21.4 ml/dl
d. 23.3 ml/dl
ANS: D
The respiratory therapist obtains a sample of arterial blood from a patient breathing 100% O2. The PO2 is 625 mm Hg, Hb is 16 g/dl, and the O2 saturation is 100%. To compute the total O2 con-tent, the respiratory therapist should apply the aforementioned equation as follows:
CaO2 = (0.003 ? PaO2) + (Hbtot ? 1.34 ? SaO2)
CaO2 = (0.003 ml ? 625 mm Hg) + (16 g/dl ? 1.34 ? 1.0)
CaO2 = (1.875 ml) + (21.44 g/dl)
CaO2 = 23.3 ml/dl
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