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THYROXINE, TOTAL

Mnemonic

T4T

Synonym

Total Thyroxine, Total Tetraiodothyronine, Total T4, TT4

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 and plasma specimens

Stability

AFTER SEPARATION FROM CELLS: Ambient (18-26°C): 8 hours; Refrigerated (2-8°C): 4 days; 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 – 1 day

7.4 – 13.0 μg/dL

1 – 3 days

11.8 – 22.6 μg/dL

3 days – 1 month

9.8 – 16.6 μg/dL

1 – 4 months

7.2 – 14.4 μg/dL

4 months – 1 year

7.8 – 16.5 μg/dL

1 – 5 years

7.3 – 15.0 μg/dL

5 – 10 years

6.4 – 13.3 μg/dL

≥10 years

4.5 – 10.9 μg/dL

CPT Codes

84436

Last Updated: Thursday, January 5, 2017 03:41:43 AM


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