A
5200 Harry Hines Blvd.
,
Dallas
,
TX
75235
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General Information
Alias: Free T4
Performed: 24 hrs.
Turn Around Time: Med Emerg: 90 minutes; Routine: 4 hrs.
CPT Codes: 84439
Performed By: Chemistry
Clinical Utility: Useful in clinical routine diagnostics for the assessment of the thryroid status. It should be measure together with TSH if thyroid disorders are suspected and is also suitable for monitoring thyrosuppressive therapy. Reflex Protocol: If Free T4 is 0.8-1.8 ng/dL, and the TSH is <0.4 mcIU/mL, Free T3 will be performed.
Components
Name |
Method |
Sex |
Age Range |
Ref. Range Low |
Ref. Range High |
Units |
Free T4 |
Electrochemiluminescence Immunoassay |
All |
0 - 150 |
0.8 |
1.8 |
ng/dL |
Free T4 Interp |
|
|
|
|
|
|
Specimen Requirements
Type |
Container |
Volume |
Units |
Collection / Delivery |
Storage / Transport |
Off Campus |
Blood |
Red w/Gel, 5mL |
Fill Tube |
|
Deliver to the Logistics laboratory. |
Room Temperature |
Specimens should be spun and aliquots prepared when needed. Store in appropriate temperature conditions and deliver to Logistics Laboratory. |