Table 2.

Arterial blood gas and lactate levels by time of test.

	Initiation	h 2	h 4	h 8	h 12	h 14	h 20	h 48
pH	6.94	7.15	7.18	7.27	7.43	7.46	7.42	7.4
pCO2 (mmHg)	14	19	23	22	29	37	41	52
pO2 (mmHg)	151	170	139	149	143	116	143	145
HCO3− (mmol/L)	3	9.5	11	12.9	20.5	26.3	26.6	32.2
Lactate (mmol/L)	15	15.5	13.9	10.2	7.6	5.4	5.7	2.5