Pf ratio formula. F represents the fio 2 the fraction percent of inspired oxygen that the patient is receiving expressed as a decimal 40 oxygen fio 2 of 040. The pf ratio is the arterial partial pressure of oxygen p a o 2 divided by the inspired oxygen concentration fio 2. Pao2fio2 ratio is the ratio of arterial oxygen partial pressure pao2 in mmhg to fractional inspired oxygen fio2 expressed as a fraction not a percentage also known as the horowitz index the carrico index and most conveniently the pf ratio at sea level the normal pao2fio2 ratio is 400 500 mmhg 55 65 kpa.
This is an unprecedented time. The horowitz index for lung function pf ratio assesses lung function particularly in intubated patients. Of course you never just go by numbers alonealways look at your patient and take in the whole picture suddenness of onset chest x ray etc.
A pf ratio less than 300 indicates acute respiratory failure. A pf ratio less than 300 is suggestive of ali while a pf ratio less than 200 is suggestive of ards which is the most severe form of ali and super scary. How to calculate the pf ratio.
P divided by f pf ratio.
Gas Exchange And Ventilation Perfusion Relationships In The Lung European Respiratory Society
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