Test Code FRET4 T4, FREE
Additional Codes
LAB127
Performing Laboratory
Porter Hospital Laboratory
Specimen Requirements
Specimen Type: Blood
Container/Tube: Tiger top, serum gel
Specimen Volume: Full tube, submit 1.5 mL serum
Specimen Minimum Volume: 0.75 mL for full cascade
Collection Instructions:
1. Send specimen in original tube.
2. If there is a delay in transport of >1 hour, centrifuge tube.
3. Centrifuged samples are stable for:
• 1 day at room temperature
• 14 days at 2 – 8ºC
Specimen Transport Temperature
Refrigerated
Day(s) Performed
Daily
Test Classification and CPT Coding
84439
Normal Reference Values
21 and older: 0.50-1.50 ng/dL
<21: See report
Critical Values
None