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Quantitative Amino Acids, Plasma (to Stanford, see Utilization Guidelines)
|Approval req'd?||Yes, if not ordered by Genetics or neurology. If ordered in previously diagnosed patients (see Utilization Guideleines)|
|Utilization Guidelines||This test should only be ordered for new diagnostic workup of patients with suspected disorders of amino acid metabolism. It should not be used for previosuly diagnosed patients for monitoring amino acid levels in response to treatment. For monitoring order "Quantitative Amino Acids, Plasma" test code "AAQT".|
|Test group||Amino Acids|
|Performed by||Lucille-Packard Children's Hospital|
|Method||Ion Exchange Chromatography|
|Patient Preparation||A 4 hour fast before specimen collection is preferred. If the patient has not been fasting indicate that on the test order.
The test request should be accompanied by a brief clinical history, the tentative diagnosis, and a listing of drugs, x-rays, infant formula or dietary therapy administered within the previous 3 days.
|Collection Instructions||If a disorder of the urea cycle is suspected, specify that the laboratory should look for argininosuccinic acid, as well. If abnormal, will comment if present. Call for phone consult with Dr. Tina Cowan (650) 724-7858|
|Container type||Dark Green top or Light Green top|
|Amount to Collect||2 mL blood|
|Sample type||Heparinized plasma, serum acceptable|
|Preferred volume||1 mL serum or plasma|
|Min. Volume||0.5 mL serum or plasma|
|Processing notes||Freeze at -20C.|
|Normal range||See report|
|Synonyms||Glycine; Homocystine; Tyrosine; Alpha-keto acids; Arginine; Arginosuccinase deficiency; Arginosuccinate Lyase deficiency; Aspartate; Aspartic acid; Beta-aminoisobutyric acid; Citrulline; Cystathionine; Cystathionuria; Ethanolamine; FeCl3 Screen; Ferric chloride screen; Glutaimic acid; Histidine; Isoleucine; Leucine; Lysine; Methionine; Ornithine; Phosphoethanolamine; Sarcosine; Serine; Taurine; Threnonine; Valine; Arginosuccinic acid; Beta-aminoisobutyric acid; Glutamine|
|Turn around times||Set up as needed, at least 2x a week.
Turnaround time: One week.
|LDT or Mod FDA?||No|
|Last Updated||5/22/2013 1:52:20 PM|
If you have additional questions regarding this test, please call: 415-353-1667