Pyruvate

Pyruvate is a key intermediate in cellular energy metabolism, sitting at the crossroads of glycolysis, gluconeogenesis, and the citric acid cycle. Blood pyruvate levels reflect the balance between aerobic and anaerobic metabolism. Elevated pyruvate, particularly with an abnormal lactate-to-pyruvate ratio, is an important indicator of mitochondrial disorders and inborn errors of metabolism. The lactate/pyruvate ratio helps distinguish mitochondrial respiratory chain defects (high ratio) from pyruvate metabolism disorders (normal ratio). Pyruvate is measured less commonly than lactate but adds diagnostic specificity in metabolic evaluations.