Clinics and Departments

Laboratory Services

Lab Dept:

Chemistry

Test Name:

PHENYLALANINE & TYROSINE, BLOOD

General Information

Lab Order Codes:

PHTY

Synonyms:

Phenylketonuria (PKU)

CPT Codes:

84510 – Tyrosine
84030 – Phenylalanine (PKU), blood

Test Includes:

Phenylalanine and Tyrosine reported in mg/dL

Logistics

Test Indications:

Useful in diagnosis of phenylketonuria (PKU) and to monitor phenylalanine and tyrosine levels in PKU patients on low phenylalanine diets.

Lab Testing Sections:

Serology – Sendouts

Referred to:

Fairview University Medical Center (Test code: TYPH)

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6500

Test Availability:

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

Turnaround Time:

2 – 5 days

Special Instructions:

N/A

Specimen

Specimen Type:

Whole blood

Container:

Green top (NaHep, no gel) tube or Lavender top (EDTA) tube or Red top (no gel) or filter paper.

Draw Volume:

2 mL blood (Minimum: 0.3 mL) or blood absorbed onto filter paper.

Processed Volume:

0.5 mL (Minimum: 0.05 mL) plasma/serum or blood absorbed onto filter paper.

Collection:

Routine venipuncture

Special Processing:

Lab Staff: Centrifuge specimen, remove serum/plasma aliquot into a screw-capped round bottom plastic vial. Store and ship at room temperature. Forward promptly.

Patient Preparation:

None

Sample Rejection:

Mislabeled or unlabeled specimens

Interpretive

Reference Range:

Phenylalanine:

Age:

Result (mg/dL):

0 – 3 months:

0.0 - 1.9 mg/dL

4 months – 11 years:

0.1 - 1.4 mg/dL

> or = 12 years:

0.5 - 1.6 mg/dL

Tyrosine

Age:

Result (mg/dL):

0 – 3 months:

0.0 - 2.7 mg/dL

4 months – 11 years:

0.4 - 1.6 mg/dL

> or = 12 years:

0.6 - 2.4 mg/dL

Critical Values:

N/A

Limitations:

N/A

Methodology:

High performance ion exchange liquid chromatography.

References:


Fairview University Medical Center
May 2008

 


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