Oxygenation PB (local barometric pressure):
PaO2 (partial pressure of arterial O2):
PaCO2 (partial pressure of arterial CO2):
FIO2 (fractional concentration of inspired oxygen):
(0.21 when breathing room air)
PH2O (water vapor pressure):
(47 mmHg at 37° C)
R (respitory quotient):
(ratio of CO2 production to O2 consumption,
usually assumed to be 0.8)
Calculate oxygenation Clear Answer and Values Entered Above


The Clinician's Ultimate Guide to Drug Therapy (www.globalrph.com) Harrison's Principles of Internal Medicine, 17e