PHENYLALANINE/TYROSINE, QUANTITATIVE, BLOOD

Methodology: Tandem Mass Spectometry

 

Test Performed At:

 

 

St. Louis Children’s Hospital

 

Specimen Required:

 

 

Collect 2.0 mL (minimum 0.5 mL) of whole blood in a green-top (lithium heparin) tube(s); a plain, red-top tube(s); a serum gel tube(s); or a green SAMPLETTE™ / MICROTAINER™.

 

Laboratory Notes:

 

 

Spin, separate, and freeze.

 

Reference Values:

 

 

PHENYLALANINE

 

 

 

Birth -1 month:

30-165 micmol/L

 

 

 

1-6 months:

25-150 micmol/L

 

 

 

6-24 months:

35-90 micmol/L

 

 

 

2-12 years:

35-90 micmol/L

 

 

 

>12 years:

35-90 micmol/L

 

 

TYROSINE

 

 

 

Birth -1 month:

20-360 micmol/L

 

 

 

1-6 months:

40-235 micmol/L

 

 

 

6-24 months:

25-85 micmol/L

 

 

 

2-12 years:

25-85 micmol/L

 

 

 

>12 years:

25-85 micmol/L

 

Day(s) Test Set Up:

 

 

Monday - Friday

 

Cut-Off Time:

 

 

 

 

Turn Around Time:

 

 

24-48 hours 

 

CPT Code:

 

 

84030 - phenylalanine

 

 

84510 - tyrosine

 

KIDDOS Order Name:

 

 

Phenylalanine/Tyrosine

 

Cerner Order Name:

 

 

Phenyl/Tyrosine

 

Last Updated 10/09

Last Reviewed 10/09