Casandra
Casandra Test Code QD57219Version 1 (DRAFT)
Performing Lab
Tyrosine
Clinical Use
Order TestUse
Phenylalanine and Tyrosine are used in the monitoring of patients with phenylketonuria (PKU) who are on special diets. Tyrosine analysis can also be used for monitoring of patients with tyrosinemia.
Special Instructions
Not provided.
Limitations
Not provided.
Test Details
Methodology
Mass Spectrometry
Biomarkers
Tyrosine
AnalyteTyrosine
Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)
Result Turnaround Time
5-10 days
Related Documents
For more information, please review the documents below
Specimen Requirements
Specimen
Plasma
Volume
0.4 mL
Minimum Volume
0.2 mL
Container
sodium heparin (green-top) tube
Patient Preparation
Collect specimen after an overnight fast (or at least 4 hours after a meal) if possible. Non‑fasting samples are acceptable for pediatric patients.
Storage Instructions
Separate plasma from cells as soon as possible and freeze below -20° C.
Causes for Rejection
Received room temperature
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | Unacceptable |
| Refrigerated | 7 days |
| Frozen | 28 days |
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