Neutral hyperaminoaciduria HP:0008353 UMLS:C1856194 The presence of an abnormally increased concentration of neutral amino acids in the urine. The neutral amino acids are tryptophan, alanine, asparagine, glutamine, histidine, isoleucine, leucine, phenylalanine, serine, threonine, tyrosine and valine. Increased proteinogenic amino acid level in urine