From: Comparison of sodium ion levels between an arterial blood gas analyzer and an autoanalyzer in preterm infants admitted to the neonatal intensive care unit: a retrospective study
Indirect Method (mmol/L)
Sodium concentration (Auto-analyzer – ABGA)
Cases (N = 1041)
Mean
P- value
<135
146
1.0 ± 2.7
<0.001
135–145
815
4.2 ± 2.9
>145
80
9.9 ± 3.7
Total
1041
4.2 ± 3.6