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T3 FREE

Message
Note: This test is sensitive to Biotin and result may be falsely elevated in patients taking high doses. 


Test Code
FT3 (OE), T3F (LAB)


Alias/See Also
Free T3


CPT Codes
84481

Preferred Specimen
1 Gold tube (SST)


Patient Preparation
None

Minimum Volume
1 mL


Other Acceptable Specimens
1 Green tube (Lithium Heparin)


OR



Instructions
Centrifuge for complete separation of serum or plasma from red cells WITHIN 2 hours.


Transport Container
GOLD tube


Transport Temperature
Refrigerate


Specimen Stability
  • 2-8°C up to 7 days
  • 15-30°C up to 8 hours
  • Frozen samples are stable


Methodology
Chemiluminescent Immunoassay

Setup Schedule
M, T, W, Th, F, Sa, Sun

As received; STAT testing not available


Report Available
Same day received


Reference Range
2.52 - 4.34 pg/mL


Clinical Significance
Utilized in the diagnosis of T3-hyperthyroidism or to monitor patients with known thyroid disorders. Usually ordered following an abnormal T4 or TSH. Includes only the unbound hormone and is unaffected by protein levels.


Performing Laboratory
Alverno Central Lab



The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.