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Test Code LAB137 T3, Free

Important Note

This test is not Reverse T3 or Total T3.

Reverse T3 is sent to Mayo and is ordered as a LAB3488.

Total T3 is done at PRMC and is ordered as LAB136.

Additional Codes

CPT Code: 84481

Performing Laboratory

TidalHealth Peninsula Regional - Core Laboratory: Chemistry

Specimen Requirements

Draw blood in a green-top (lithium heparin) tube is preferred (Serum is not acceptable.) Spin down and separate 1 mL of plasma within 30 minutes.  Test within 8 hrs at room temp or within 48 hrs refrigerated.  Freeze if not tested within 48 hrs. 

 

Reference Values

0-2 months: 4.7-5.4 pg/mL

2 months - 2 years: 5.7-6.4 pg/mL

2-7 years: 5.3-6.2 pg/mL

7-12 years: 5.0-6.0 pg/mL

12-20 years: 4.8-6.0 pg/mL

> 20 years: 2.0-4.4 pg/mL

 

Methodology

Electrochemiluminescence immunoassay (ECLIA)