Table 3.

Serial ABG analysis results

ABG	Referred range	Day 1	Day 2 before intubation	Day 9 after extubation	Day 21 (with CPAP)	Day 32 (in room air)	Day 45 (in room air
pH	7.35–7.45	7.2	7.145	7.35	7.33	7.34	7.38
PCO2	40–50 mm Hg	59.2	79.2	90.4	65.1	48.2	40.2
PO2	80–100 mm Hg	42.7	76	88.2	48.4	78.5	82.2
HCO3	22–26 meQ/L	27.7	27.5	50.9	35.4	26.7	25.6
BE	−2 to +2	0.6	−1.6	20.5	7.7	1.0	1.2
SaO2	95%–100%	70.4	86%	95%	79.6%	94.6%	98%

ABG, arterial blood gas; CPAP, continuous positive airway pressure; HCO₃, bicarbonate; Pco₂, partial pressure of carbon dioxide; PO₂, partial pressure of oxygen; SaO₂, arterial oxygen saturation.