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Amino Acid Analysis, Quantitative, Plasma

Amino Acids, Plasma, Quantitative

Test Codes

EPIC: LAB8110, Beaker: AA Plasma, 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.

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: 14 days

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

8/12/2025