Biochemical analysis
LP and SSLX measure lactate in whole blood by amperometry, whereby lactate is converted into pyruvate and hydrogen peroxide, which is then oxidized. The resulting electric current is proportional to the lactate level. LP was calibrated for every 25th analysis with a control test-strip and SSLX was calibrated daily with a test solution. SSLX requires only 0.6μL of blood and 13s for analysis. SSLX measures lactate in the range 0.3-20mmol/L and interferences of haematocrit, paracetamol, bilirubin, acetaminophen, ascorbic and uric acid are eliminated by algorithms. To ensure an acceptable agreement between the two BGAs, 108 fresh arterial and venous cord samples were analysed in parallel.