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Phenylalanine Monitoring, Plasma
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Ordering Recommendation
Use for monitoring patients with an established diagnosis of phenylketonuria (PKU).
Mnemonic
Methodology
Quantitative Liquid Chromatography/Tandem Mass Spectrometry
Performed
Mon-Fri
Reported
2-5 days
New York DOH Approval Status
Specimen Required
Green (sodium or lithium heparin).
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)
Frozen.
Hemolyzed specimens.
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
This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.
Laboratory Developed Test (LDT)
Note
This test is designed to monitor treatment and compliance in PKU patients.
Hotline History
Hotline History
CPT Codes
82131
Components
| Component Test Code* | Component Chart Name | LOINC |
|---|---|---|
| 0080315 | Phenylalanine, Plasma | 14875-9 |
Aliases
- Phenylalanine, Plasma
- plasma phenylalanine
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