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HelpTest Code LAB355 Amino Acids Quant, Urine
Clinical System Name
Amino Acids Quant, Urine Random (LAB355)
Amino Acids Quant, Uri 24 hr (LAB1938)
Synonyms
U AAQNT
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.