Doctor's Data Inc

Phenylalanine; plasma

CPT Code

82139

Specimen Requirements

2 mL plasma (deproteinized)

Collection Container/Tube

EDTA Purple-top vacutainer tube

Transport Container/Tube

8 mL plasma transfer vial containing Sulfo salicylic acid (SSA)

Minimum Specimen Volume

1 mL plasma

Rejection Criteria

Grossly hemolyzed
Specimen not kept cold

Stability Information

Room temperature: 1 day
Refrigerated: 4 days
Frozen: 30 days
37°C/99°F: Unacceptable

Methodology

LC/MS QQQ

Turnaround Time

3 - 5 days

Reference Intervals

Sex Age
Both 1-16 years 3-8 uM/dL
Both 17-99 years 4-9 uM/dL