Given Mrs Doherty’s drowsiness, it is important to ensure she has not developed type 2 respiratory failure. 

pH 7.30 (normal range 7.35-7.45)

pC02 52 mmHg (normal range 36-45 mmHg)

p02 140 mmHg (on oxygen) (normal range 85-110 mmHg)

Bicarbonate 23 mmol/L (normal range 21-28 mmol/L)

02 saturation 100%  (normal range <95%)