Amino Acids, Quantitative
Order Code: AAQTP
Epic Lab Code: LAB2578
Order Form: A-1a Miscellaneous Request or Epic Req
Commercial Mail-out Laboratory
6240 RCP
356-3527
Specimen:
Plasma
Collection Medium:
Green top tube 4 mL (Na Heparin)
Minimum:
Preferred minimum: 4 mL heparinized plasma in a green-top (heparin) tube from a fasting patient (4 hours or more in infants). Absolute miniumum: 0.5 mL heparinized plasma
Rejection Criteria:
Thrombin-activated tube is not acceptable.
Specimen Instructions:
Patient's age is required on request form for processing. Include family history, clinical condition (asymptomatic or acute episode), diet, and drug therapy information.
Analytic Time:
5 days upon receipt at reference laboratory
Reference Range:
Age-dependent reference values are listed under "Inborn Errors of Amino Acid Metabolism" in Special Instructions, by report.
Interpretive Data:
When abnormal results are detected, a detailed interpretation is given, including an overview of the results and of their significance, a correlation to available clinical information, elements of differential diagnosis, recommendations for additional biochemical testing, and in vitro confirmatory studies (enzyme assay, molecular analysis), name and phone number of key contacts who may provide these studies at the reference laboratory or elsewhere, and a phone number to reach one of the laboratory directors in case the referring physician has additional questions.
Test Limitations:
Biochemical test results depend in part on the clinical and dietary status at the time of specimen collection. A normal or non-diagnostic test result does not rule out the possibility of an underlying metabolic disorder, including that for which the test was requested.
Methodology:
Liquid Chromatography-Tandem Mass Spectometry (LC-MS/MS)

Includes quantitation of the following amino acids: taurine, threonine, serine, asparagine, glutamic acid, glutamine, proline, glycine, alanine, citrulline, a-amino-n-butyric acid, valine, cystine, methionine, isoleucine, leucine, tyrosine, phenylalanine, b-alanine, ornithine, lysine, histdine, argininosuccinic acid, allo-isoleucine, and arginine.
CPT Code:
82139
 
See Additional Information:
Fasting Specimen Requirements