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Test Code U AAQNT Amino Acids Quant, Urine

Clinical System Name

Amino Acids Quant, Urine

Description

Quantitation of 24 amino acids by ion exchange chromatography

Sample Requirements

Specimen: Urine

Container(s): Leak-Proof Container, 24 Hour Urine Jug

Preferred Vol:  5.0 mL

Minimum Vol: 1.0 mL

 

Note:  In most cases, random samples are adequate & 24-hr collection is not required.

Processing Instructions

Reject due to:

Spin:N

Aliquot:Y

Temp:-20 C

Storage location: BCG Box

 

Off-site collection: Aliquotes should be taked from a thoroughly thawed & mixed refrigerated sample.  Ship frozen.

Stability

Temperature Time
Room temp ≤2 hrs
Refrigerated 24 hrs
Frozen 1 month

 

Availability

STAT Performed TAT
N M-F 2-5 days

Contact the Biochemical Genetics Lab for requests outside of stated availability (206)987-2216.

Performing Laboratory

Seattle Children's Laboratory    

Department

Department:  Biochemical Genetics

Phone Number: 206-987-2216

 

 

Methodology

Method: Ion exchange chromatography with post column derivatization

Analytical Volume: 0.2 mL

Limitations:

CPT Codes

82139

Requisition

Biochemical Genetics Requisition

 

On the requisition include clinical inforamtion needed for appropriate interpretation. (Age, gender, diet (e.g. TPN therapy), drug therapy and family history)

Clinical Utility

Urine amino acid analysis can be useful in the clinical work up of the following disorders:

 

Urea cycle defects (argininosuccinic aciduria, argininemia, CPS, OTC deficiency, citrullinemia), non-ketotic hyperglycinemia, homocystinuria, defects of cobalamin metabolism, cystinuria, ornithinemia, renal tubular acidosis/fanconi syndrome, and lysinuric protein intolerance.