Plasma

Green top tube 4 mL (Na Heparin)

Thrombin-activated tube is not acceptable.

Patient's age is required on request form for processing. Include family history, clinical condition (asymptomatic or acute episode), diet, and drug therapy information.

5 days upon receipt at reference laboratory

Age-dependent reference values are listed under "Inborn Errors of Amino Acid Metabolism" in Special Instructions, by report.

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.

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.

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.

82139

See Additional Information:
Fasting Specimen Requirements