T3 (TRIIODOTHYRONINE), FREE

Specimen Required
Draw blood in a SST. Centrifuge, separate and send 1.0 mL serum (0.5 mL minimum) refrigerated in a screw-capped plastic vial.

Alternate Specimen
Serum: Red-top

Rejection Criteria
Severely hemolyzed or lipemic specimens, plasma

Methodology
Chemiluminescence

Stability
Room Temperature; 8 hours; Refrigerated: 72 hours; Frozen: 14 days

Reference Range
Age   Reference range  
1-23 months   3.3-5.2 pg/mL  
24 months (2 Years)-12 years   3.3-4.8 pg/mL  
13 years-20 years   3.0-4.7 pg/mL  
21 years and above   2.3-4.2 pg/mL  

Performed
Monday-Friday

Turnaround Time3 days
Test CodeFT3
CPT-4 Code (s)
84481
LOINC Codes
3051-0

Warde
Medical
Laboratory