Abstract
Blood pyruvate measurement in conjunction with lactic acid is useful for differentiating pyruvate dehydrogenase deficiencies from primary or secondary disorders of mitochondrial electron transport. We evaluated the analytical performance of pyruvate measurement by an enzymatic open channel assay on a Roche Cobas 6000. The assay was linear from 0.07 to 0.50 mmol/L pyruvate. Total imprecision ranged from 15.7% to 7.1% at pyruvate levels of 0.08 to 0.31 mmol/L, respectively. Functional sensitivity was 0.07 mmol/L. The assay showed no interference by lipids or bilirubin, whereas haemolysis influenced pyruvate concentrations in a hemoglobin concentration-independent manner. Method comparison with patient samples (n = 41) showed that the Cobas 6000 enzymatic method correlated well (r2 = 0.930) with a similar enzymatic assay on a Cobas Mira platform and showed better accuracy in external control schemes. Enzymatic pyruvate measurement by a Cobas 6000 open channel shows satisfactory analytical performance. The assay can be integrated in the automated laboratory workflow and is always ready for use thanks to its on-board reagents.
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