Phenylalanine, Quantitative, Plasma

TEST: 700205
Test number copied
CPT: 82131
Print Share

Special Instructions

Blood spots on filter paper are not an acceptable specimen type. This test is not to be used for newborn screening.

Expected Turnaround Time

3 - 5 days

Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.

Related Information

Specimen Requirements

Specimen

Plasma, frozen

Volume

0.5 mL

Minimum Volume

0.25 mL

Container

Preferred: Frozen plasma from green-top (sodium heparin) tube. Acceptable: Frozen plasma from green-top (lithium heparin) tube, frozen plasma from lavender-top (EDTA) tube or frozen plasma from PPT™. Frozen serum from serum separator tube (SST) or frozen serum from red-top tube will not be rejected. Note: Plasma reference ranges will be applied to all specimen types.

Collection

Separate plasma from cells. Transfer specimen to plastic transport tube before freezing. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.

Storage Instructions

Centrifuge, remove plasma from cells, and freeze immediately.

Stability Requirements

Temperature

Period

Room temperature

Unstable

Refrigerated

Unstable

Frozen

14 days

Causes for Rejection

Gross hemolysis; room temperature or thawed specimens; specimens collected in yellow-top (ACD) tubes

Test Details

Limitations

This test was developed, and its performance characteristics determined, by LabCorp. It has not been cleared or approved by the US Food and Drug Administration (FDA).

Methodology

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

Reference Interval

See Plasma Amino Acid Reference Intervals in the Test Resources pages online.

References

Bremer HJ, Duran M, Kamerling JP, et al. Disturbances of Amino Acid Metabolism: Clinical Chemistry and Diagnosis. Baltimore, Md: Urban and Schwarzenberg; 1981.

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
700205 Phenylalanine, Qn, P 14875-9 700033 Phenylalanine umol/L 14875-9
700205 Phenylalanine, Qn, P 14875-9 700168 Phenylalanine(mg/dL) mg/dL 2765-6
700205 Phenylalanine, Qn, P 14875-9 700065 Methodology 49549-9
700205 Phenylalanine, Qn, P 14875-9 700471 Disclaimer: N/A

For Providers

Please login to order a test

Order a Test

© 2021 Laboratory Corporation of America® Holdings and Lexi-Comp Inc. All Rights Reserved.

CPT Statement/Profile Statement

The LOINC® codes are copyright © 1994-2021, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf