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winter's formula is to look at the compensation to see if it is appropriate.
PCO2 = 1.5[HCO3-] + 8 +/- 2
In this case, 1.5* 10 (Pt's bicarb) +8 +/-2 = 21 to 25
Pt's PO2 is 23, so compensation is appropriate. If PCO2 was below 21, it would be concomitant respiratory alkalosis
in other words, winter's formula is not necessary for this question
@ergogenic22 Someone might use Winter's formula to rule out choice A.
Isn't the low pCO2 enough to rule out A?