Item Value
Test name Thyroxine Binding Globulin
Available Stat? No
Turn around times Test performed Wednesday, Friday & Sunday. Turnaround time: 1-4 days.
Performed by Quest
Normal range
4-6 years 14.8-32.9 µg/mL
7-8 years 16.3-30.7 µg/mL
9-10 years 15.8-27.4 µg/mL
11 years 15.5-27.4 µg/mL
12 years 14.8-26.2 µg/mL
13 years 13.8-25.2 µg/mL
14 years 12.2-25.2 µg/mL
15 years 10.8-23.8 µg/mL
16 years 10.0-23.8 µg/mL
17 years 8.5-23.1 µg/mL


Tanner Stages Males Females
Stage I 13.5-28.4 µg/mL 14.2-28.5 µg/mL
Stage II 15.1-25.9 µg/mL 15.0-23.1 µg/mL
Stage III 14.0-26.3 µg/mL 13.7-23.0 µg/mL
Stage IV 13.2-25.0 µg/mL 12.0-22.8 µg/mL
Stage V 12.2-23.7 µg/mL 9.1-22.8 µg/mL


≥ 18 year old females 13.5-30.9 µg/mL
≥ 18 year old males 12.7-25.1 µg/mL


To convert to nmol/L, multiply the result by 18.5.



Container type Red top (Gold top NOT acceptable)
Amount to Collect 2 mL blood
Sample type Serum

If you have additional questions regarding this test, please call: 415-353-1667