PHENYLALANINE/TYROSINE, QUANTITATIVE, BLOOD
test app
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Specimen Type:
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Blood |
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Container/Tube
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Preferred:
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Mint green-top (lithium heparin) Vacutainer®
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Acceptable:
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green SAMPLETTE™/MICROTAINER®; Plain, Red-top Vacutainer ®; Gold/Red SST gel Vacutainer® or Dark Green-top (NaHep) Vacutainer®.
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Collection Volume:
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2.0 mL (minimum 0.5 mL)
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Patient Preparation:
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None
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Sample Rejection
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Mislabeled or unlabeled specimens.
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Special Instructions:
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Send to lab promptly.
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Test Availability:
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Daily
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Days set up:
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Monday-Friday
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Cut-off time:
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Varies; batched once per day in a.m.
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Turnaround Time:
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24-72 hours
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Lab Testing Section:
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Metabolic Genetics
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Reference Range:
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PHENYLALANINE
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< 1 month:
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30-120 micmol/L
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>=1 month:
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30-90 micmol/L
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TYROSINE
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< 1 month:
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30-300 micmol/L
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1 mo - 1 year:
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25-150 micmol/L
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> or = 1 year:
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25-100 micmol/L
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Critical Values:
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None established
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Limitations:
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NA
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Methodology:
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Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
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| 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. |
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Lab Processing instructions:
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Centrifuge specimen to separate and aliquot sample into a plastic conical tube (label as serum if collected in red top or gold/red tube). Place aliquot tube in freezer. (see note below)
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Processed Volume:
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0.3 mL plasma/serum
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Analyte Stability:
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Ambient (whole blood or processed): 5 days
PROCESSED
Refrigerated: 1 week
Frozen: Indefinitely
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Notes:
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Specimens coming from outside facilities that are in aliquot containers should be kept in original container sent when given to Met. Genetics lab (put in freezer). |
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EPIC order name:
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Phenylalanine/Tyrosine
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Cerner order name:
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Phenyl/Tyrosine
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CPT Codes:
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84030 - Phenylalanine
84510 - Tyrosine
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LOINC Value:
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Phenylalanine: 14875-9
Tyrosine: 20660-7
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Synonyms:
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Last Updated: 06/24
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Last Reviewed: 06/24
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