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Reverse T3
Abbreviation: rT3
Panel: Thyroid Tests · All thyroid tests
Typical adult reference range
| Conventional units | 10–24 ng/dL |
| SI units | 0.15–0.37 nmol/L |
Ranges vary between laboratories and methods — compare your result with the range printed on your own report.
What a high or low result can mean
High reverse t3: high values can be seen in severe non-thyroid illness.
Low reverse t3: low values are not usually clinically significant.
These are associations, not a diagnosis: the same result can have several causes, and your clinician interprets it with the rest of your results and history.
Good to know
An inactive metabolite of T4; not part of routine thyroid testing.
Related tests — Thyroid Tests
Please note: Reference ranges vary between laboratories, and between the methods and instruments they use — the range printed on your own report is the one your result should be compared with. A result outside the range is not by itself a diagnosis, and a result inside it does not rule out illness. These pages are an educational summary, not medical advice: always discuss your results with the clinician who ordered them, who can interpret them in the context of your health and history.