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HelpTest Code LAB127 T4, Free
Performing Lab
Arnot Ogden Medical Center
Ordering Recommendations
Evaluating suspected thyroid function disorders using free thyroxine measured together with thyroid-stimulating hormone
Collect
Heparinized Plasma or Serum
Collection Device
Green or Gold Top Tube
Specimen Volume
5 mL
Stability (from collection to initiation)
| Room Temp | 8 Hours |
| Refrigerated | 48 Hours |
| Frozen | Indefinite |
Storage/Transport Temperature
Room Temp, Refrigerated, Frozen
Minimum Requirements
0.5 mL
Methodology
Chemiluminescence
Specimen Handling
Centrifuge within 2 hours of collection.
Remarks
TURN AROUND TIME
| STAT | 1 Hour |
| Routine | 8 Hours |
Start Date
9/13/2017
Last Review Date
10/26/25 ES