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Test Code LAB355 Amino Acids, Quantitative, Urine

Performing Laboratory

St. Louis Children's Hospital

Last Reviewed

June 2024

Lab Dept

Metabolic Genetics

Specimen Requirements

Specimen Type: Urine (random or timed)

Container/Tube  
Preferred: Random: A clean, plastic urine container(s) with no preservative.
Timed: 24 hour urine collection jug
Acceptable: Clean, screw-cap container with no preservative.
Collection Volume: 5.0 mL (minimum of 1.0 mL) of a random collection or entire sample collected during a timed period.
Patient Preparation: See Urine Collection instructions

Sample Rejection:

Specimens collected with acid as preservative.
Mislabeled or unlabeled specimens.
Special Instructions: If collecting a timed specimen, refrigerate specimen during collection and note collection start and stop times on collection container.

Barnes-Jewish Hospital Note:

Call Laboratory Medicine resident at digital pager 314-747-1320 for approval before obtaining specimen.

 

Submit an entire 24-hour urine collection in a plain, brown urine container.
Additional Information:
1. Starting and ending times of collection are required.
2. Follow instructions for Urine Collection in Special Instructions.
3. Urine timed measurement is performed at an additional charge per 24-hour collection (CPT Code-81050).

Interpretive

Reference Range:

Age-dependent

See Amino Acid Reference Values

Critical Values: None established

Limitations: NA
Methodology: Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Test Classification: This test was developed and its performance characteristics determined by St. Louis Children's Hospital Clinical Laboratory. It has not been cleared or approved by the U.S. Food and Drug Administration.

Additional Information

For SLCH Laboratory use only

Lab Processing instructions: Mix specimen well and aliquot sample into a conical plastic vial. Place original collection container (with any remaining sample) in freezer #1.Give aliquot to Chem COBAS bench and let them know they have Met Genetics specimen that needs to be frozen post analysis.

If specimen submitted is from 24-hour collection, note 24-hr volume on aliquot label.

Processed Volume: 5.0 mL (minimum 1.0 mL) urine

NO SPECIMEN SHOULD BE REJECTED FOR VOLUME! GIVE ALL SPECIMENS TO METABOLIC GENETICS TO DECIDE IF QNS.
Analyte Stability: Creatinine performed on receipt, Entire collection then frozen.
NOTES: Give specimen to chemistry bench to run Creat prior to freezing.
If specimen needs to be shared with UA bench make sure they are aware that specimen is shared and original container needs to be placed in MetGen basket in freezer.

General Information

EPIC order name: Amino Acids, Urine, Random (EPIC Test # LAB562)
Cerner order name: Amino Acid Ur
CPT Codes: 82139
LOINC Value: NA
Synonyms:

Logistics

Day(s) Test Set Up: Monday-Friday
Cut-off time: 0430
Turnaround Time: 5 days
Lab Testing Section: Metabolic Genetics

Barnes-Jewish Hospital Additional Information:

 

For BJH Laboratory Use Only
Laboratory Processing Instructions:BJH Core Lab will forward to the performing laboratory.