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HelpTest Code LAB3371 Phenylalanine, Tyrosine
Clinical System Name
Phenylalanine, Tyrosine
Description
Quantitation of phenylalanine and tyrosine by ion exchange chromatography for PKU monitoring.
Sample Requirements
Specimen: Whole Blood
Container(s): Dark Green/Sodium Heparin, Lt. Green/Lithium Heparin
Preferred Vol: 1 mL
Minimum Vol: 0.5 mL
Note: Serum is acceptable but not preferred.
Processing Instructions
Reject due to:
Spin:Y
Aliquot:Y
Temp:-20 C
Storage location: -20 C BCG Box
Off-site collection: Spin and separate serum/plasma within 1 hr of collection. Freeze plasma/serum and ship frozen.
Stability
| Temperature | Time |
|---|---|
| Room temp (whole blood) | < 1 hr |
| Room temp (serum/plasma) | ≤ 2 hr |
| Refrigerated (serum/plasma) | 24 hrs |
| Frozen (Plasma/Serum) | 1 month |
Performing Laboratory
Seattle Children's Laboratory
Department
Department: Biochemical Genetics
Phone Number: 206-987-2216
Synonyms
Phe Tyr
Availability
| STAT | Performed | TAT |
|---|---|---|
| N | M-F | 3 days |
Contact the Biochemical Genetics Lab for requests outside of stated availability (206)987-2216.
Methodology
Method: Ion exchange chromatography with post column derivatization
Analytical Volume: 0.1 mL
Limitations:
CPT Codes
Phe 84030
Tyr 84510
Requisition
Biochemical Genetics Requisition
On the requisition include clinical information needed for appropriate interpretation. (Age, gender, diet (e.g. TPN therapy), drug therapy and family history)
Reference Ranges
|
(mg/dL) |
|
| Phenylalanine |
0.7 - 1.8 |
| Tyrosine | 0.8 - 1.8 |