Agreement between Arterial and Capillary pH, pCO₂, and Lactate in Patients in the Emergency Department

Table 3

Subgroup analysis according to delays in sampling and suspected diagnosis.

	pH			pCO2			Lactate
	Bias	95% LOA		Bias	95% LOA		Bias	95% LOA
Delay ≤ 1 min	0.009	−0.047	0.065	−0.24	−8.11	7.63	−0.88	−2.40	0.64
Delay = 2 min	0.011	−0.056	0.078	−0.38	−10.86	10.09	−0.94	−2.64	0.76
Delay > 2 min	0.012	−0.044	0.068	−0.82	−7.96	6.14	−1.2	−3.30	0.9
MAP ≥ 65 mmHg	0.010	−0.048	0.069	−0.43	−8.8	7.94	−0.91	−2.51	0.7
MAP ≤ 65 mmHg	0.002	−0.058	0.054	1.76	−6.88	10.39	−1.22	−2.48	0.03
Obstructive pulmonary disease	0.003	−0.052	0.059	0.15	−9.32	9.61	−0.85	2.00	0.3
Other respiratory failures	0.012	−0.059	0.083	−0.33	−10.25	9.59	−1.19	−3.01	0.62
Metabolic disturbances	0.014	−0.032	0.060	−1.21	−6.42	4.00	−0.89	−2.05	0.29
Cardiac failure	0.005	−0.042	0.053	−0.09	−8.49	8.3	−0.64	−2.43	1.14
Other	0.015	−0.047	0.078	−0.51	−7.88	6.87	−0.98	−2.89	0.93

BGA, blood gas analysis; LOA, limits of agreement; MAP, mean arterial pressure.