Alanine, Beta-alanine, Alpha-aminoadipate, Alpha-aminobutyrate, Gamma-aminobutyrate, Beta-aminobutyrate, Ammonia, Anserine, Arginine, Asparagine, Aspartate, Carnosine, Citrulline, Creatinine, Cystathionine, Cysteine, Cystine, Ethanolamine, Glycine, Glutamate, Glutamine, Histidine, Homocysteine, Hydroxyproline, Isoleucine, Leucine, Lysine, Methionine Sulfoxide, Methionine, 1-Methylhistidine, 3-Methylhistidine, Ornithine, Phenylalanine, Phosphoethanolamine, Phosphoserine, Proline, Sarcosine, Serine, Taurine, Threonine, Tryptophan, Tyrosine, Valine, Urea
25 mL of first morning urine before food or drink is required. The patient should discontinue amino acid supplementation prior to the collection of specimen.
The 24 hour urine collection requires that the patient collect every urine specimen over a 24 hour period. The patient should avoid amino acid supplementation 24 hours prior to the collection of specimen.