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Clinical Chemistry 26: 1804-1808, 1980;
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Clinical Chemistry, Vol 26, 1804-1808, Copyright © 1980 by American Association for Clinical Chemistry

Free amino acid analysis of untimed and 24-h urine samples compared

MY Tsai, JG Marshall and MW Josephson

We measured 11 amino acids in untimed urine samples, to determine whether such samples are suited for use in diagnosis of aminoacidurias. Results for untimed samples varied by as much as 25% more than for 24-h collections when amino acid excretions were expressed in terms of urinary creatinine. Values decreased with increasing age for either type of specimen. Urinary amino acid excretions were also determined with untimed or 24-h samples from patients with cystinuria. Lowe's syndrome, nonketotic hyperglycinemia, or phenylketonuria. In all cases studied, the amino acids diagnostic of the diseases significantly exceeded the reference interval obtained for 260 control subjects in six age categories. We conclude that untimed urine samples can be used for diagnosis of these inborn errors of amino acid metabolism, but further studies are needed to evaluate their usefulness for other metabolic disorders.


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 Clin. Chem.Home page
R. Venta
Year-Long Validation Study and Reference Values for Urinary Amino Acids Using a Reversed-Phase HPLC Method
Clin. Chem., March 1, 2001; 47(3): 575 - 583.
[Abstract] [Full Text] [PDF]


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