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Thyroxine Binding Globulin
| Item |
Value |
| Approval req'd? |
No |
| Available Stat? |
No |
| Test code |
TBG |
| Test group |
Thyroid tests |
| Performed by |
Quest |
| Sendout? |
Yes |
| Method |
Chemiluminescence |
| Container type |
Red top (Gold top unacceptable) |
| Amount to Collect |
2 mL blood |
| Sample type |
Serum |
| Preferred volume |
1 mL serum |
| Min. Volume |
0.5 mL serum |
| UCSF Rejection Criteria |
Collected in Gold top. |
| Processing notes |
Freeze serum at -20°C. Order Quest # 30213P. For B&T patients order BTMOLT, LabCorp Test # 001735 |
| Units |
µg/mL (mcg/mL) |
| 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.
|
| Synonyms |
TBG; T4 binding globulin |
| Stability |
Room temperature 1 week, refrigerated 1 week, frozen at -20C 1 month. |
| Turn around times |
Test performed Wednesday, Friday & Sunday. Turnaround time: 1-4 days. |
| Additional information |
TBG binds T4 and T3 (T4 more tightly than T3), and carries 70% of the thyroid hormone in the blood. It is indirectly estimated with Thyroid Uptake. Direct measurement is useful only for rare conditions such as congenital deficiency or excess of TBG |
| LOINC code |
3021-3 |
| Last Updated |
8/21/2012 10:48:55 AM |
| Entry Number |
922 |
If you have additional questions regarding this test, please call: 415-353-1667
