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Phenylalanine, quantitative, plasma-994

Test info

Test name:

Phenylalanine, quantitative, plasma

Test number:

994

Excellian order number:

LAB994

Abbreviation:

MSO

Limitations:

This test is not to be used for newborn screening

Specimen

Specimen type:

Sodium heparin (Na hep) plasma

Collection container:

Dk green Sodium heparin (Na hep), no gel

Volume:

0.5 mL

Minimum volume:

0.3 mL

Collection instructions:

Immediately following collection, mix sample thoroughly by gently inverting 8 - 10 times to prevent clotting

Processing instructions:

Spin within two (2) hours of sample collection
Transfer plasma to a Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp), labelled as Na hep plasma
Freeze

Transport container:

Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp)

Alternate specimen type:

EDTA plasma
Lithium heparin (Li hep) plasma

Alternate collection container:

Lavender (EDTA), 4mL

Dk green Lithium heparin (Li hep), no gel

Alternate processing instructions:

Spin within two (2) hours of sample collection
Transfer plasma to a Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp), labelled as the appropriate plasma type
Freeze

Transport and stability:

Frozen (strict) - 14 days

Ambient - NO

Refrigerated - NO

Reason for rejection:

Gross hemolysis
Specimens receive ambient
Thawed specimens

Performance

Performing lab:

LabCorp Burlington (700205): R-NX

Days set up:

Mo - Fr

TAT:

3 - 5 days

Method:

Liquid chromatography/tandem mass spectrometry (LC/MS-MS)

Clinical and Interpretive info

Reference ranges:

See report

Billing

CPT codes:

82131

Tracking

Date created:

01/07/2021

Revised date:

04/28/2026

Review date:

04/28/2026