T3 Free (Triiodothyronine)*

SIM

LAB93137

CPT

84481 

Synonyms

Free T3; Triiodothyronine, Free; Serum Free T3; Unbound T3 

Specimen Type

Serum 

Container

Red-top tube, gel-barrier tube, or green-top (lithium heparin) tube. Do not use oxalate, EDTA, or citrate plasma.

Collection Instructions

Volume

Volume: 1.0 mL 
Minimum volume: 0.7 mL(This does not allow for repeat testing) 

Additional Information

Evaluate thyroid function and assess abnormal binding protein disorders

Patient Preparation

Specimen Processing Instructions

If a red-top tube or plasma is used, transfer separated serum or plasma to a plastic transport tube.

Transport Requirements

Room Temperature

Specimen Stability

Room Temperature : 14 days 

Rejection Criteria

Citrate plasma specimen; improper labeling

Reference Range

Reference range accompanies report

Critical Value

Test Includes

Free T3 

Methodology

Electrochemiluminescence immunoassay (ECLIA) 

Testing Frequency

LCA

010389 

Reviewed By

Rhonda Crowe

Reviewed Date

3/1/23

Supplemental

* Denotes Reference Lab Test