Print

Tyrosine and Phenylalanine


Sunquest Code:TYPH  
Epic Code:LAB3799Epic Name:TYROSINE AND PHENYLALANINE
Synonyms:Phenylalanine and Tyrosine; Phenylketonuria (PKU) Testing
Methodology:High performance ion exchange liquid chromatography
CPT Code:84510, 84030
Turnaround Time:Performed Mon and Wed; results are reported the next day.


Collection Instructions

Specimen:Blood
Optimal Volume:2 mL
Minimum Volume:0.3 mL or blood absorbed onto filter paper
Container:Green (sodium heparin, no gel). Alternate: Filter paper; Green (lithium heparin, no gel); Green (lithium heparin, gel); Purple (EDTA); Red (no gel).


Processing and Shipping

Specimen Processing:Centrifuge and aliquot 1 mL, 0.05 mL minimum. Store at room temperature.
Shipping Instructions:Ship at room temperature.
Test Performed at or Referral Lab Biochemical Genetics  (UMMC-East Bank)


Interpretive

Reference Range:

 

Age

mg/dL

Phenylalanine

0-3 mo

0.0-1.9

 

4 mo to 11 y

0.1-1.4

 

12 y and older

0.5-1.6

Tyrosine:

0-3 mo

0.0-2.7

 

4 mo to 11 y

0.4-1.6

 

12 y and older

0.6-2.4

 

 

Use:Diagnosis of phenylketonuria (PKU) and to monitor phenylalanine and tyrosine levels in PKU patients on low phenylalanine diets.


Click HERE to Report test errors or omissions.