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Test Code 1311 Organic Acids, Qualitative, Urine

Performing Laboratory

St. Louis Children's Hospital

Last Reviewed

January 2018

Additional Information

For SLCH Laboratory use only


Lab Processing instructions: Mix specimen well and aliquot sample into a 13-mL screw-cap, plastic vial. Place original collection container (with or without 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.

Processed Volume: 10.0 mL (minimum 6.0 mL) urine
Analyte Stability:

Ambient: NA
Refrigerated: NA
Frozen: NA
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.


Reference Range: Interpretation report provided
Critical Values: NA
Limitations: Patients on MCT (medium chain triglyceride) oil exhibit a pattern consistent with that seen in MCAD deficiency. Any patient showing significant peaks of adipate, sebacate, and suberate should be investigated for MCT oil. Some formulas containing MCT oil are Alimentum, Progestamyl, Progentyl, and Pediasure.
Methodology: Gas Chromatography/Mass Spectrometry (GC/MS)

Specimen Requirements

Specimen Type: Urine (random or timed)


Timed: 24 hour urine collection jug
Random: A clean, plastic urine container(s) with no preservative.
Acceptable: Clean, screw-cap container with no preservative.
Collection Volume: Entire sample collected during a timed period or a minimum of 6.0 mL of a random collection.
Patient Preparation: None

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 drawing the specimen.


24-Hour Collection

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).


Random Collection

See Specimen Required.


Day(s) Test Set Up: Monday-Friday
Cut-off time: 06:30 a.m.
Turnaround Time: 1-3 days
Lab Testing Section: Metabolic Genetics

General Information

KIDDOS order name: Organic Acids Urine
Cerner order name: Organic Ac Ur
CPT Codes: 83919

Lab Dept

Metabolic Genetics

Barnes-Jewish Hospital Additional Information:
For BJH Laboratory Use Only
Laboratory Processing Instructions:
BJH Chemistry will forward to the performing laboratory.