624074/07 F-57
Therefore, S/F ratio is a useful monitoring value for an easy bed
side assessment of a patient’s oxygenation status, and can be
helpful relative to ALI and ARDS diagnosis and status follow up
of these patients.
The S/F value is calculated on the HAMILTON-G5 if the
measured SpO
2
is lower than 95%. With SpO
2
values greater
than 94%, the oxygen-haemoglobin dissociation curve
becomes “flat” and the SpO
2
correlation to PaO
2
is poor,
making S/F ratio unreliable for P/F ratio approximation (Figure
F-25).
Figure F-25. Oxygen-haemoglobin dissociation curve
F.14 References
• Rice TW, Wheeler AP, Bernard GR, Hayden DL, Schoen-
feld DA, Ware LB. Comparison on the SpO
2
/FiO
2
ratio and
the PaO
2
/FiO
2
ratio in patients with acute lung injury or
ARDS. Chest. 2007 Aug;132(2):410-7. Epub 2007 Jun 15.
• Khemani RG, Patel NR, Bart RD 3rd, Newth CJ. Compar-
ison of the pulse oximetric saturation/fraction of inspired
oxygen ratio and the PaO
2
/fraction of inspired oxygenation
in children. Chest. 2009 Mar;135(3):662-8. Epub 2008 Nov
24
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