PHENYLALANINE MONITORING, PLASMA

Specimen Required
Draw blood in a green sodium or lithium heparin tube. Centrifuge, separate plasma from cells within 2 hours and send 0.5 mL plasma (0.25 mL minimum) frozen in a screw-capped plastic vial.

Methodology
Quantitative Liquid Chromatography/Tandem Mass Spectrometry

Stability
Room Temperature: Unacceptable; Refrigerated: 24 hours; Frozen: 1 month

Reference Range
0-1 year: 30–110 µmol/L
>=1 year: 30–80 µmol/L

Performed
Monday-Friday

Turnaround Time5-7 days
Test CodeZPNYL
CPT-4 Code (s)
82131
LOINC Codes
14875-9

Warde
Medical
Laboratory