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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 |
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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