Amino Acid Analysis, Limited, Plasma

Test Code

AAQT LTD

Quest Code

1776

CPT Codes
82139

Includes

Isoleucine, Leucine, Phenylalanine, Tyrosine, Tryptophan, Valine

Preferred Specimen

2 mL plasma collected in a sodium or lithium heparin (green-top) tube or EDTA (lavender-top) tube

Patient Preparation
Collect plasma specimens after an overnight fast (or at least 4 hours after a meal). Non-fasting samples are acceptable for pediatric patients.

Minimum Volume

0.25 mL

Instructions

Plasma should be separated from cells as soon as possible after collection. Freeze plasma below -20 degrees C. Include date of collection and age of patient. (Age must be provided for the interpretation and age related reference ranges to print on the report.

Transport Temperature

Frozen

Specimen Stability

Room temperature: Unacceptable
Refrigerated: 7 days
Frozen: 30 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Gross hemolysis • Received room temperature

Methodology
Chromatography/Mass Spectrometry

FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by the FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Setup Schedule

A.M.

Reference Range

See Laboratory Report

Clinical Significance

Amino Acid analysis is necessary for the diagnosis of a variety of inborn errors of metabolosm. These include, but are not limited to, phenylketonuria, tyrosinemia, maple syrup urine disease, and homocystinuria. The assay is also key for the continued monitoring of treatment plans for these disorders and useful for assessing nutritional status of patients. Our methodology is highly accurate at very low levels as well as at elevated levels.

Performing Laboratory
Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano, CA 92690-6130

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.