Sign in →

Test Code LAB1103 Phenylalanine and Tyrosine, Plasma

Additional Codes

PATY

 

Reporting Title

Phenylalanine and Tyrosine, P

Methodology

Tandem Mass Spectrometry (MS/MS)

Useful For

Used to monitor known PKU and maternal hyperphenylalanemia patients; NOT for diagnostic purposes. A FULL serum amino acid profile (QAAS) is the recommended test for the follow-up to an abnormal newborn screening test. If collecting specimen with a blood spot card, do not allow capillary tube or patient heel to touch the collection card. Completely fill 1-2 circles. Allow card to air dry for 3 hours before sending to laboratory. Cards are available from Laboratory Services (614-722-5477).

Performing Laboratory

Nationwide Children's Hospital, ChildLab Columbus Ohio

Specimen Transport Temperature

Blood Filter Paper Card

Specimen Type Temperature Time
 Filter Paper Room Temp Indefinite

Green Top Tube (Lithium Heparin), No Gel

Specimen Type Temperature Time Specimen Volume
 Plasma Refrigerated 4 hours  2 ml
  Frozen Indefinite  2 ml

Red Top Tube, No gel

Specimen Type Temperature Time Specimen Volume
 Serum Refrigerated 4 hours  2 ml
  Frozen Indefinite  2 ml

 

Day(s) Test Set Up

Dayshift

Monday-Friday

Typical Turnaround Time: 3 days

Test Classification and CPT Coding

84030-Phenylalanine

84510-Tyrosine

Specimen Preparation

  • Collect sample after a 3-4 hour fast
  • Collect from infants just prior to feeding
  • Place on ice immediately after collection
  • Transport to laboratory immediately after collection