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Triiodothyronine, Free

Mnemonic

T3F

Synonym

Free Triiodothyronine - Free T3 - FT3

Specimen Collection Requirements

Collect

Serum, one 5.0 mL gold (SST) or 7.0 mL red top tube

Supply Item Number - 101235 or 101192

Handling

Allow serum tubes to clot completely at room temperature (minimum - SST: 30 minutes, red top tubes: 60 minutes). Centrifuge and separate serum from cells ASAP. 

Preferred Volume

1.0 mL Serum

Minimum Volume

0.4 mL Serum (1.0 mL minimum whole blood draw)

Transport

Refrigerated (2-8°C)

Rejection Criteria

  • Grossly hemolyzed specimens
  • Plasma specimens
  • Specimens frozen and thawed more than once

Stability

AFTER SEPARATION FROM CELLS: Room Temperature (18-26°C): 8 hours; Refrigerated (2-8°C): 7 days; Frozen (≤ -20°C): 1 month.  Do not freeze/thaw more than once.

Testing Information

Performed

7 days/week

Reported

24 hours

Method

Chemiluminescent Immunoassay

Reference Values

Reference Values

2.3-4.2 pg/mL

CPT Codes

84481

Last Updated: Thursday, February 11, 2021 10:43:37 PM


Client Services: 503-413-1234