Phenylalanine and Tyrosine Build info

Synonyms

• PHENYLALANINE/TYROSINE RATIO MEASUREMENT
• PHENYLKETONURIA
• TYROSINEMIA
• LAB10967

Short Name

PHENYLALANINE/TYROSINE RATIO MEASUREMENT

Procedure Master Number

LAB10967

Procedure ID

114380

Clinical Info

Monitoring effectiveness of therapy in patients with hyperphenylalaninemia

This test is not sufficient for follow-up for abnormal newborn screening results or for establishing a diagnosis of a specific cause of hyperphenylalaninemia.

Specimen Type

Blood

Container

Lavender Top Tube

Collection Instructions

Container/Tube: Dark Green top (sodium heparin) or Lavender (EDTA Top Tube
Specimen: 2.0 mL (minimum volume: 0.5 mL) of whole blood Send original rube do not aliquot
Transport Temperature: Room Temperature

Alternate:
Blood Spot Card 2 spots Protect from Light

Transport Instructions

Refrigerated

Specimen Stability

Whole Blood
4 Days Room Temperature or Refrigerated

Methodology

Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)

Days Performed

Monday through Friday
TAT: 4-6 Days

Performing Laboratory

Mayo Medical Labroratories

CPT

84030-Phenylalanine
84510-Tyrosine
LONIC Code: 79621-9

PDM

5302878

Results