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Amino Acid Analysis, Quantitative

Amino Acids, Plasma, Quantitative

Test Codes

EPIC: LAB5936, Beaker: XAAP, Mayo: AAQP

Department

Send Outs

Instructions

Fasting (overnight preferred, 4 hours minimum). Infants should be drawn just before next feeding (2-3 hours without parenteral nutrition, if possible).

Specimen Collection Criteria

Collect (preferred specimen): One Dark Green-top Sodium Heparin tube.

Also acceptable: One Dark Green-top Lithium Heparin or Lavender-top EDTA tube.

Critical frozen. Send specimens for processing immediately after collection on wet ice.

Physician Office/Draw Specimen Preparation

Critical frozen. Centrifuge immediately or within 4 hours of collection, if specimen is kept in refrigerated temperature. Transfer plasma to a plastic transport tube and freeze (-20°C/-4°F or below) immediately.

Preparation for Courier Transport

Transport: 0.5 mL plasma, frozen (-20°C/-4°F or below). (Minimum: 0.3 mL)

Rejection Criteria

Specimens not collected or processed as indicated.

In-Lab Processing

Critical frozen. Centrifuge immediately or within 4 hours of collection, if specimen is kept in refrigerated temperature. Transfer plasma to a plastic transport tube and freeze (-20°C/-4°F or below) immediately.

Transport: 0.5 mL plasma, frozen (-20°C/-4°F or below). (Minimum: 0.3 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): Unacceptable
Refrigerated (2-8°C or 36-46°F): Unacceptable
Frozen (-20°C/-4°F or below): 14 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Laboratory

Sent to Mayo Medical Laboratories, Rochester, MN.

Performed

Monday – Friday.
Results available in 3-5 days.

Reference Range

By report.

Test Methodology

Quantitative Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS).

Clinical Utility

This assay aids in the diagnosis of aminoacidopathies, urea cycle defects, and organic acidurias.

CPT Codes

82139

Contacts

Last Updated

10/16/2023