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Triiodothyronine, Total

Mnemonic

T3T

Synonym

Total Triiodothyronine, Total T3, TT3

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 to clot completely at room temperature (minimum: 30 minutes). Centrifuge and separate serum from cells ASAP.

Preferred Volume

1.0 mL Serum

Minimum Volume

0.3 mL Serum (0.8 mL minimum whole blood draw)

Transport

Refrigerated (2-8°C)

Rejection Criteria

Grossly hemolyzed or plasma specimens

Stability

AFTER SEPARATION FROM CELLS: Room Temperature (18-26°C): 8 hours; Refrigerated (2-8°C): 48 hours; Frozen (≤ -20°C): 1 month

Testing Information

Performed

7 days/week

Reported

24 hours

Method

Chemiluminescent Immunoassay

Reference Values

Reference Values

Age

Male and Females

0 – 3 days

100 – 740 ng/dL

3 days – 1 month

103 – 422 ng/dL

1 month – 1 year

105 – 245 ng/dL

1 – 6 years

105 – 269 ng/dL

6 – 11 years

94 – 241 ng/dL

11 – 16 years

83 – 213 ng/dL

≥16 years

60 – 181 ng/dL

CPT Codes

84480

Last Updated: Thursday, February 11, 2021 10:50:19 PM


Client Services: 503-413-1234