Total Thyroxine, Total Tetraiodothyronine, Total T4, TT4
Specimen Collection Requirements
Serum, one 5.0 mL gold (SST) or 7.0 mL red top tube
Supply Item Number - 101235 or 101192
Allow serum to clot completely at room temperature (minimum – SST: 30 minutes, red top tubes: 60 minutes). Centrifuge and separate serum from cells ASAP.
0.3 mL Serum (0.8 mL minimum whole blood draw)
Grossly hemolyzed and plasma specimens
AFTER SEPARATION FROM CELLS: Room Temperature (18-26°C): 8 hours; Refrigerated (2-8°C): 4 days; Frozen (≤ -20°C): 2 months
Testing Information
Chemiluminescent Immunoassay
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
|
Last Updated:
Thursday, March 14, 2019 12:51:12 PM
Client Services: 503-413-1234