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HelpTest Code FT4 T4 (Thyroxine), Free
Performing Laboratory
| Memorial Hospital Laboratory- Automated Procedures | 304-388-5953 |
| Teays Valley Hospital Laboratory | 304-757-1770 |
| Plateau Medical Center Laboratory | 304-469-8621 |
| Greenbrier Valley Laboratory | 304-647-6060 |
| Parkersburg Laboratory | 304-865-3679 |
| Beckley Cancer Center Laboratory | 304-461-2222 |
Specimen Requirements
Memorial, Teays, Plateau
Plasma-Mint Green, Dark Green Lithium Heparin or Serum-SST gold top, red top
Allow SST or red top to completely clot
Spin and physically separate plasma/serum from contact with cells as soon as possible
4 mL of plasma/serum (minimum 2 mL)
Greenbrier, Beckley, Parkersburg
Serum-SST gold top, red top
Allow SST or red top to completely clot
Spin and physically separate serum from contact with cells as soon as possible
4 mL of serum (minimum 2 mL)
Specimen Rejection
- Improperly labeled, collected, stored, and transported
- Quantity not sufficient
Additional rejections at Greenbrier, Beckley, Parkersburg
- Turbid
- Hemolyzed
- Lipemic
Storage and Stability
Memorial, Teays, Plateau
| Room temperature 15-30oC | 8 hrs |
| Refrigerated 2-8oC | 48 hrs |
| Frozen <-20oC | Not specified |
Greenbrier, Beckley, Parkersburg
| Refrigerated 2-8oC | 7 days |
| Frozen <-20oC | 4 weeks |
Reference Values
| Age Range | Reference Range (ng/dL) |
| 0 days - <20 days | 0.66-2.88 |
| 20 days - <3 yrs | 0.74-1.38 |
| 3 yrs - <19 yrs | 0.61-1.23 |
| 19 yrs - 150 yrs | 0.6 - 1.3 |
Methodology
Memorial, Teays, Plateau-Chemiluminescent two-step immunoenzymatic assay
Greenbrier, Beckley, Parkersburg- Competitive immunoassay
Days Test Set Up and Turnaround
Memorial, Teays, Plateau, Greenbrier
Monday through Sunday, Continuously
| AM Collection | Expected by 9AM same day |
| Routine | Expected within 24 hrs |
| Stat | Expected within 1 hr |
| Timed | Expected results are test dependant |
Beckley, Parkersburg
Monday through Friday
CPT Coding
84439