T4 (Thyroxine), Free
Order Name
T4F
Revision Date 07/02/2018
Revision Date 07/02/2018
| Test Name | Methodology | LOINC Code |
|---|---|---|
|
T4 (Thyroxine), Free
|
| SPECIMEN REQUIREMENTS | ||||
|---|---|---|---|---|
| Specimen | Specimen Volume (min) | Specimen Type | Specimen Container | Transport Environment |
| Preferred | 1 mL (0.5 mL) | Plasma | Lithium Heparin | |
| Alternate 1 | 1.0 mL ( 0.5 mL) | Serum | Serum Gel Tube | Refrigerated |
| Instructions | Draw blood in a serum gel tube(s) or Lithium Heparin tube(s). Spin down and send 1 mL (minimum volume: 0.5 mL) of serum refrigerated. Note: Label specimen with patient name (first and last) or other unique identifier, patient hospital identification number or Social Security number, date and time of draw, collector initials, and test(s) being ordered. |
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| Reference Range | 0.7-6.0 ng/dL | |||
| GENERAL INFORMATION | |
|---|---|
| Testing Schedule | Monday through Sunday |
| Expected TAT | 2 hours |
| Stat TAT | 45 Minues |
| Notes | Separate serum from cells within 4 hours of collection. Stability after separation: Ambient: 8 Hours Refrigerated: 48 Hours Frozen: Indefinite (Thaw samples only once) |
| CPT Code(s) | 84439 |
| Lab Section | NRLS-Core Chemistry |