Recommendations when to order or not order the test. May include related or preferred tests.
Use for monitoring patients with an established diagnosis of phenylketonuria (PKU).
Mnemonic
Unique test identifier.
QNTPHE
Methodology
Process(es) used to perform the test.
Liquid Chromatography-Tandem Mass Spectrometry
Performed
Days of the week the test is performed.
Mon-Fri
Reported
Expected turnaround time for a result, beginning when ARUP has received the specimen.
2-5 days
New York DOH Approval Status
Indicates test has been approved by the New York State Department of Health.
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
Normal range/expected value(s) for a specific disease state. May also include abnormal ranges.
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
Background information for test. May include disease information, patient result explanation, recommendations, details of testing, associated diseases, explanation of possible patient results.
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.
Compliance Category
Laboratory Developed Test (LDT)
Note
Additional information related to the test.
This test is designed to monitor treatment and compliance in PKU patients.
Hotline History
N/A
CPT Codes
The American Medical Association Current Procedural Terminology (CPT) codes published in ARUP's Laboratory Test Directory are provided for informational purposes only. The codes reflect our interpretation of CPT coding requirements based upon AMA guidelines published annually. CPT codes are provided only as guidance to assist clients with billing. ARUP strongly recommends that clients confirm CPT codes with their Medicare administrative contractor, as requirements may differ. CPT coding is the sole responsibility of the billing party. ARUP Laboratories assumes no responsibility for billing errors due to reliance on the CPT codes published.
* 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.
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