Ordering Recommendation

Use for monitoring patients with an established diagnosis of phenylketonuria (PKU).

Mnemonic
QNTPHE
Methodology

Quantitative Liquid Chromatography/Tandem Mass Spectrometry

Performed

Mon-Fri

Reported

2-5 days

New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
Collect

Green (sodium or lithium heparin).

Specimen Preparation

Separate plasma from cells ASAP or within 2 hours of collection. Transfer 0.5 mL plasma to an ARUP Standard Transport Tube. (Min: 0.25 mL)

Storage/Transport Temperature

Frozen.

Unacceptable Conditions

Hemolyzed specimens.

Remarks
Stability

After separation from cells: Ambient: Unacceptable; Refrigerated: 24 hours; Frozen: 1 month

Reference Interval

Effective November 18, 2019

Age Reference Interval
0-30 days 30-95 µmol/L
1 month - 11 months 30-90 µmol/L
1 year and older 30-82 µmol/L

Interpretive Data



Compliance Category

Laboratory Developed Test (LDT)

Note

This test is designed to monitor treatment and compliance in PKU patients.

Hotline History
N/A
CPT Codes

82131

Components
Component Test Code* Component Chart Name LOINC
0080315 Phenylalanine, Plasma 14875-9
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • Phenylalanine, Plasma
  • plasma phenylalanine
Phenylalanine Monitoring, Plasma