Test Details
Methodology
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
Result 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.
Special Instructions
Blood spots on filter paper are not an acceptable specimen type. This test is not to be used for newborn screening.
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).
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 Instructions
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.
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | Unstable |
Refrigerated | Unstable |
Frozen | 14 days |
Reference Range
See Plasma Amino Acid Reference Intervals in the Test Resources pages online.
Storage Instructions
Centrifuge, remove plasma from cells, and freeze immediately.
Causes for Rejection
Gross hemolysis; room temperature or thawed specimens; specimens collected in yellow-top (ACD) tubes
References
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 | |
| Order Code | 700205 | |||||
| Order Code Name | Phenylalanine, Qn, P | |||||
| Order Loinc | 14875-9 | |||||
| Result Code | 700033 | |||||
| Result Code Name | Phenylalanine | |||||
| UofM | umol/L | |||||
| Result LOINC | 14875-9 | |||||
| Order Code | 700205 | |||||
| Order Code Name | Phenylalanine, Qn, P | |||||
| Order Loinc | 14875-9 | |||||
| Result Code | 700168 | |||||
| Result Code Name | Phenylalanine(mg/dL) | |||||
| UofM | mg/dL | |||||
| Result LOINC | 2765-6 | |||||
| Order Code | 700205 | |||||
| Order Code Name | Phenylalanine, Qn, P | |||||
| Order Loinc | 14875-9 | |||||
| Result Code | 700065 | |||||
| Result Code Name | Methodology | |||||
| UofM | ||||||
| Result LOINC | 49549-9 | |||||
| Order Code | 700205 | |||||
| Order Code Name | Phenylalanine, Qn, P | |||||
| Order Loinc | 14875-9 | |||||
| Result Code | 700471 | |||||
| Result Code Name | Disclaimer: | |||||
| UofM | ||||||
| Result LOINC | N/A |