Commonly Used Formulas
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A-a gradient = [(P
B
-PH
2
O) FiO
2
- PCO
2
/R] - PO
2
arterial
= (713 x FiO
2
- pCO
2
/0.8 ) -pO
2
arterial
P
B
= 760 mmHg; PH
2
O = 47 mmHg ; R = 0.8
normal Aa gradient <10-15 mmHg (room air)
Arterial oxygen capacity =(Hgb(gm)/100 mL) x 1.36 mL O
2
/gm Hgb
Arterial O
2
content = 1.36(Hgb)(SaO
2
)+0.003(PaO
2
)= NL 20 vol%
O
2
delivery = CO x arterial O
2
content = NL 640-1000 mL O
2
/min
