Triiodothyronine, Free Only

CPT: 84481

Synonyms

Free T3 Only

Expected Turnaround Time

2 - 3 days

Specimen Requirements


Specimen

Serum

Volume

0.8 mL

Minimum Volume

0.3 mL (Note: This volume does not allow for repeat testing.)

Container

Red-top tube

Collection

Separate serum within one hour; transfer into a plastic transport tube.

Storage Instructions

Ship frozen on dry ice.

Test Details


Methodology

Immunochemiluminometric assay (ICMA)

Reference Interval

Age Range (pg/mL) <4d 2.0 - 7.9 4d - 1m 2.0 - 5.2 1 - 11m 1.6 - 6.4 1 - 5y 2.0 - 6.0 6 - 10y 2.7 - 5.2 11 - 19y 2.3 - 5.0 >=20y 2.0 - 4.4