Biochemical analysis
There were no clinically important differences in blood gas values obtained from the two different brands of BGAs (results not shown) and hence no need for conversion equations. Mean difference between LP and SSLX was insignificant 0.17 mmol/L (p = 0.11). The correlations between SSLX and umbilical arterial blood pH and lactate were dependent on the time from FBS to delivery with the optimal correlations in women 0-25 minutes from FBS to delivery where R represent the correlation coefficient: R-pH = -0.30 (95% CI: -0.38 - (-0.22)) and R-lactate = 0.57 (95% CI: 0.51-0.64) (Table not shown). Therefore, a cohort (FBS to delivery 0-25 minutes, n = 799) was created for calculation of ROC curves.