Thyroxine-Binding Globulin

Thyroxine-Binding Globulin is a topic covered in the Davis's Lab & Diagnostic Tests.

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To evaluate thyroid hormone levels related to deficiency or excess to assist in diagnosing disorders such as hyperthyroidism and hypothyroidism.

Patient Preparation
There are no food, fluid, activity, or medication restrictions unless by medical direction.

Normal Findings
Method: Immunochemiluminometric assay (ICMA).

AgeConventional UnitsSI Units (Conventional Units × 10)
0–1 wk3–8 mg/dL30–80 mg/L
1–12 mo1.6–3.6 mg/dL16–36 mg/L
14–19 yr1.2–2.5 mg/dL12–25 mg/L
Greater than 20 yr1.3–3.3 mg/dL13–33 mg/L
Pregnancy, third trimester4.7–5.9 mg/dL47–59 mg/L
Oral contraceptives1.5–5.5 mg/dL15–55 mg/L

Critical Findings and Potential Interventions

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