Lab Dept:

Urine/Stool

Test Name:

AMINO ACIDS, QUANTITATIVE 24 HOUR, URINE

General Information

Lab Order Codes:

AAUQ

Synonyms:

N/A

CPT Codes:

82139 – Amino acids; 6 or more, quantitative, each specimen

Test Includes:

Alanine, Allo-Isoleucine, α-Aminoadipic Acid, α-Amino-n-Butyric Acid, Anserine, Arginine, Argininosuccinic Acid, Asparagine, Aspartic Acid, β-Alanine, β-Aminoisobutyric Acid, Carnosine, Citrulline, Cystathionine, Cystine, Ethanolamine, Glutamic Acid, Glutamine, Glycine, Histidine, Hydroxylysine, Isoleucine, Leucine, Lysine, Methionine, 1-Methylhistidine, 3-Methylhistidine, Ornithine, Phenylalanine, Phosphoethanolamine, Phosphoserine, Proline, Sarcosine, Serine, Taurine, Threonine, Tryptophan, Tyrosine, Valine

Logistics

Test Indications:

Inborn errors of amino acid metabolism can manifest themselves at anytime in a person’s life, but most become evident in infancy and early childhood.

Affected persons may have failure to thrive, neurological symptoms, digestive problems, locomotor retardation, and a wide spectrum of laboratory findings.

If not diagnosed promptly and treated properly, these disorders can result in poor growth, mental retardation, and death.

Amino acid analysis may also have clinical importance in the evaluation of several acquired conditions, including endocrine disorders, liver diseases, muscle diseases, neoplastic diseases, neurological disorders, nutritional disturbances, renal failure, and burns.

Lab Testing Sections:

Urine/Stool - Sendouts

Referred to:

Mayo Medical Laboratories (Test# 8392)

Phone Numbers:

Minneapolis:

Saint Paul:

612-813-6280

651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

1 – 2 days, test set up Monday – Friday.

Special Instructions:

Submit an entire 24-hour urine. No preservative. Refrigerate specimen during and after collection.

Note: Starting and ending times of collection are required for a timed urine collection and must be documented electronically or on the proper request form.

Note: Provide clinical history, clinical condition (asymptomatic or acute), diet, and drug therapy.

Specimen

Specimen Type:

Urine, 24 hour collection

Container:

Plastic leakproof urine container

Draw Volume:

Submit an entire 24-hour urine collection

Processed Volume:

2 mL (Minimum: 1.0 mL) aliquot urine

Collection:

For timed urine collections, empty the bladder, discard the voided sample, and note the start time. Collect all urine voided for the specified time period. At the end of the period, note the finishing time, add the last voided sample to the container by emptying the bladder. Bring the refrigerated container to the lab. Make sure all specimens submitted to the laboratory are properly labeled with the patient’s name, medical record number and date of birth.

Special Processing:

Lab Staff: Mix collection well before aliquot is taken. Measure total urine and record total volume and duration. No preservatives are necessary. Specimen should be processed and frozen within 4 hours of collection completion. Remove urine aliquot into a screw-capped round bottom plastic vial. Store and ship at frozen temperatures. Forward promptly.

Patient Preparation:

None

Sample Rejection:

Warm specimens

Interpretive

Reference Range:

See the following link for a complete list of reference values.

http://www.mmllink.com/

Critical Values:

N/A

Limitations:

N/A

Methodology:

Ion-exchange chromatography, quantitative

Contraindications

N/A

References:

Mayo Medical Laboratories Web Page http://www.mayomedicallaboratories.com/

Updates:

3/1/2004: Test moved from Fairview Diagnostic Laboratories to Mayo Medical Laboratories.