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Lab Dept:
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Chemistry
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Test Name:
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PHENYLALANINE & TYROSINE, BLOOD
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General Information
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Lab Order Codes:
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PHTY
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Synonyms:
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Phenylketonuria (PKU)
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CPT Codes:
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84510 - Tyrosine
84030 – Phenylalanine (PKU), blood
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Test Includes:
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Phenylalanine and Tyrosine reported in mg/dL
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Logistics
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Test Indications:
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Useful in diagnosis of phenylketonuria (PKU) and to monitor phenylalanine and tyrosine levels in PKU patients on low phenylalanine diets.
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Lab Testing Sections:
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Serology – Sendouts
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Referred to:
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Fairview University Medical Center (Test code: TYPH)
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6500
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Test Availability:
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Daily, 24 hours and performed on the following schedule at Fairview. All specimens will be processed and held to be run on these days: Mondays and Wednesdays
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Turnaround Time:
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2 – 5 days
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Special Instructions:
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N/A
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Specimen
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Specimen Type:
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Whole blood
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Container:
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Green top (NaHep, no gel) tube or Lavender top (EDTA) tube or Red top (no gel) or filter paper.
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Draw Volume:
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2.0 mL blood (Minimum: 0.3 mL) or blood absorbed onto filter paper.
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Processed Volume:
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0.5 mL (Minimum: 0.05 mL) plasma/serum or blood absorbed onto filter paper.
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Collection:
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Routine venipuncture
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Special Processing:
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Lab Staff: Centrifuge specimen, remove serum/plasma aliquot into a screw-capped round bottom plastic vial. Store and ship at room temperature. Forward promptly.
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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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Interpretive
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Reference Range:
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Phenylalanine:
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Age:
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Result (mg/dL):
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0 – 3 months:
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0.0 - 1.9 mg/dL
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4months – 11years:
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0.1 - 1.4 mg/dL
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> or = 12 years:
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0.5 - 1.6 mg/dL
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Tyrosine
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Age:
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Result (mg/dL):
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0 – 3 months:
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0.0 - 2.7 mg/dL
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4 months – 11years:
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0.4 - 1.6 mg/dL
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> or = 12 years:
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0.6 - 2.4 mg/dL
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Critical Values:
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N/A
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Limitations:
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N/A
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Methodology:
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High performance ion exchange liquid chromatography.
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Contraindications:
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N/A
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References:
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Fairview University Medical Center
http://labguide.fairview.org/showTest.asp?testid=22 May 2008
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