Genetic testing - Lactic Acidosis deficiency pyruvate dehydrogenase (See pyruvate dehydrogenase deficiency ...).

See:

Pyruvate dehydrogenase deficiency ...; Complex deficiency pyruvate dehydrogenase; Lactic acidosis pyruvate dehydrogenase deficiency (Pyruvate dehydrogenase deficiency, pyruvate dehydrogenase complex deficiency) - Genes PDHA1, PDHB, PDHX, PDP1 and DLAT.