There is no significant shunt.

The patient's hypoxia corrects with oxygen, which would not occur if a shunt was present. Note that the patient's pCO2 is still quite low (29), indicating that she is still breathing rapidly. She probably had not been on oxygen long when this sample was drawn.

Hematocrit               32.1 %
WBC                    9800   /ul
Serum bicarbonate        27   meq/l
Arterial Blood gases: 
              ___________Room Air_____________
              At rest          During exercise       Rest/oxygen
pO2             91                   67                  541
pCO2            32                   37                   29
pH            7.46                 7.41                 7.49