LabwiseTotal T4ug/dL
Total T4 measures all thyroxine in the blood, both bound to proteins and free. Free T4 is used more often today.
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What Total T4 measures
Total T4 measures all thyroxine in the blood, both bound to proteins and free. Free T4 is used more often today.
If your Total T4 is low
Total T4 below the range can reflect thyroid activity or lower binding proteins.
Commonly associated with
- Underactive thyroid
- Low binding proteins
- Severe illness
If your Total T4 is high
Total T4 above the range can reflect thyroid activity or higher binding proteins, as in pregnancy or with estrogen-containing medication.
Commonly associated with
- Overactive thyroid
- Pregnancy
- Estrogen-containing medication
Typical reference range
| Group | Typical range |
|---|---|
| Adults | 4.5 – 12 ug/dL |
Typical adult values used by many US labs. Your own report prints the range your lab validated for its method, and that range is the one that counts. Labwise always uses the printed range first.
If it is within range
Your total T4 is within the range printed by your lab.
Also listed as
T4, Total, Thyroxine (T4), T4 (Thyroxine), Total, Thyroxine, Total
Related tests
This page is general information about what a laboratory test measures and what results outside a reference range are commonly associated with. It is not medical advice, does not diagnose any condition and does not replace your clinician. Discuss your results with your healthcare provider.