preferred_name: Quantitative measurement of 16 central carbon metabolites (α-ketoglutarate, alanine, lactate, phenylalanine, pyruvate, succinate, carnitine, citrate, fumarate, hypoxanthine, inosine, malate, S-sulfocysteine, taurine, urate, and xanthine) by liquid chromatography tandem mass spectrometry (LC-MS/MS) in plasma, with algorithmic analysis result reported as negative or positive (with metabolic subtypes of autism spectrum disorder)