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Phenylalanine, Quantitative, Plasma

CPT 82131

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.

Related Information

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).

References

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

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

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 Code700205
Order Code NamePhenylalanine, Qn, P
Order Loinc14875-9
Result Code700033
Result Code NamePhenylalanine
UofMumol/L
Result LOINC14875-9
Order Code700205
Order Code NamePhenylalanine, Qn, P
Order Loinc14875-9
Result Code700168
Result Code NamePhenylalanine(mg/dL)
UofMmg/dL
Result LOINC2765-6
Order Code700205
Order Code NamePhenylalanine, Qn, P
Order Loinc14875-9
Result Code700065
Result Code NameMethodology
UofM
Result LOINC49549-9
Order Code700205
Order Code NamePhenylalanine, Qn, P
Order Loinc14875-9
Result Code700471
Result Code NameDisclaimer:
UofM
Result LOINCN/A