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Test Name:
Phenylalanine and Tyrosine, Plasma
- SBMF No:
45386 - Performance Lab Name:
ARUP Laboratories - Test Mnemonic:
PHE/TYR - ABN:
Not required - CPT Code:
84030; 84510 - LOINC Code:
14875-9; 20660-7 - Ref Lab Test No:
0080336 - Test Includes:
Phenylalanine Monitoring, Plasma
Tyrosine, Plasma - Also Known As:
PKU monitoring - Also See:
44424 Phenylalanine Monitoring, Plasma
45385 Tyrosine, Plasma - Spec Type:
Plasma - Spec Container:
Green top (heparin) tube - Pref Vol:
0.5 mL - Min Vol:
Pediatric Collection: 0.25 mL - Fasting:
No - Spec Collect:
Routine venipuncture - Spec Process:
Promptly centrifuge 15 minutes
Immediately transfer plasma to separate plastic tube and freeze - Spec Store Transport:
Frozen - Spec Stability:
After separation from cells:
Room temperature (20-30°C): Unacceptable
24 hours refrigerated (2-8°C)
1 month frozen (-20°C) – Do not use frost-free units that undergo repeated freeze/thaw cycles - Spec Reject:
Hemolyzed sample - Spec Remarks:
Separate plasma from cells ASAP - Methodology:
Ion Exchange Chromatography - Use:
This test is designed to monitor treatment and compliance in PKU patients - Reference Range:
- Phenylalanine Monitoring, Plasma
- 0-11 months: 30-100 μmol/L
1 year and older: 30-80 μmol/L - Tyrosine, Plasma
- 0-11 months: 30-140 μmol/L
1 year and older: 30-120 μmol/L
- Day Run:
Mon-Fri - Time Reported:
3-6 days - Test Type:
CHEMISTRY
