Amino Acid Profile, Quantitative, Plasma

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Condition Description

Plasma amino acids analysis will detect specific amino acid disorders such as phenylketonuria (PKU), maple syrup urine disease (MSUD), urea cycle defects, non-ketotic hyperglycinemia and homocystinuria, etc. Plasma amino acids values are compared to age-matched normal values. Quantitative analysis of amino acids can also be performed to monitor established patients diagnosed with metabolic disorders. 


This test is indicated in the case of:
  • Infants with a positive newborn screening result indicative of a metabolic disorder.
  • Evaluation of patients with signs of a possible metabolic condition, such as lethargy, vomiting, and failure to thrive.
  • Monitoring for individuals diagnosed with a metabolic condition.


Quantitative ion exchange chromatography, reported as micromoles/L.


This test is very sensitive for specific amino acid disorders, but detection can be sensitive to the clinical and nutritional status of the patient.

Specimen Requirements

Type: Plasma

Specimen Requirements:

In sodium heparin (green top) tube: 1-2 ml

Sample should be collected while fasting or 2-4 hours postprandial.

Centrifuge to separate plasma and freeze.

Specimen Collection and Shipping: Ship frozen sample on dry ice with overnight delivery.

Special Instructions

Please indicate any medications or dietary changes on the test requisition form.
  • Organic Acids Quantitative Analysis (OA) is used in the diagnosis and evaluation of patients with metabolic conditions.

How to Order