Amino
Acid Screen, Urine
Test Includes: All amino acids.
Availability: Mon. - Fri., 0800 - 1700
Turnaround Time: 2-10 days.
Minimum Volume: 2.0 mL.
Specimen Handling: Random urine, morning specimen preferred. Refrigerate or freeze without
preservative.
Causes For Rejection: Specific gravity of the urine must
be >1.010.
Interpretive Reference Range: Subjective interpretation.
Use: Screening for inborn errors of amino acid metabolism.
Limitations: Urines that are too dilute can not be evaluated.
Methodology: Paper chromatography and cyanide-nitroprusside
test for sulfhydryls and disulfides.
Additional Information: Excretion of certain amino acids
is increased in several aminoacidemias,
such as phenylketonuria and maple syrup urine disease, and in inherited and acquired disorders of the
proximal renal tubule.
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Page updated 11/9/2009
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