What does RA mean on a medical chart?

I've found out its like room air or something but i don't know what the percentage means. The scenario i was given says there's 93% RA.

Janae2012-02-09T07:27:36Z

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It means that 93% of the hemoglobin in your blood is carring oxygen.

?2012-02-09T15:22:37Z

that your 93% medicaly enticipated