Table 2
Results of hypoxic challenge test (15% Fi
o
2
for 20 minutes) with AHCPR grading (Appendix 2)
Hypoxic challenge result
Recommendation
Pa
o
2
>7.4 kPa (>55 mm Hg)
Oxygen not required [
B
]
Pa
o
2
6.6–7.4 kPa (50–55 mm Hg)
Borderline; a walk test may be helpful [
C
]
Pa
o
2
<6.6 kPa (<50 mm Hg)
In-flight oxygen (2 l/min) [
B
]