I'm a 38 years male, have a nearly normal PFT (My PFT done today shows pre-BD FEV1 4.12L and FVC 5.8L, DLCO 99%, RV 100% and TLC 107%), I know the ratio is just a little bit above 0.7, but I'm suffering from frequent SOB and low SPO2 (88% ~ 96%, number was confirmed by hospital device).
Blood test shows no heart attack, heart failure or anemia.
Last week I did another CT scan and it was clear (No emphysema, no obvious thickening of airway, no pulmonary embolism).
Heart echocardiogram shows no abnormality.
But.... ABG that was done 1 hour after the PFT is consistent with my symptom: PH 7.37, PCO2 45.6, PO2 78, O2 Saturation 95 and Bicarbonate 26.7. Low O2 and high CO2, compensated respiratory acidosis.
The ABG was tested during my symptomless hour, I guess the number would be worse if I was in SOB.
My doctor said my symptom doesn't seem to be related to this mild obstruction of my lung. And I think she might be right because the peak flow and FEV1 doesn't actually drop when SOB happens, so it doesn't seem to be ventilation related; and I believe CT and DLCO will show some abnormality if it's related to gas exchange issue.
Any idea why I might have a bad ABG result?