ARUP's Laboratory Test Directory

Phenylalanine & Tyrosine : 0080336

Mnemonic: PHE/TYR

Methodology: Ion Exchange Chromatography
Performed: Mon-Fri
Reported: 2-5 days
Specimen Required: Collect: Green (sodium or lithium heparin).

Specimen Preparation: Transfer 0.5 mL plasma to an ARUP Standard Transport Tube. (Min: 0.25 mL)

Storage/Transport Temperature: Frozen.

Unacceptable Conditions: Hemolyzed specimens.

Stability (collection to initiation of testing): After separation from cells: Ambient: Unacceptable; Refrigerated: 24 hours; Frozen: 1 month
Reference Interval:
 
Test Number Components Reference Interval
0080315Phenylalanine Monitoring, Plasma 0-11 months: 30-100 µmol/L
1 year and older: 30-80 µmol/L
0080355Tyrosine, Plasma 0-11 months: 30-140 µmol/L
1 year and older: 30-120 µmol/L

Note: This test is designed to monitor treatment and compliance in PKU patients.
CPT Code(s): 82131; 84510