Thyroid
Reverse T3 (rT3)
Reverse T3 is an inactive form of thyroid hormone produced when the body converts T4 to rT3 instead of active T3. Elevated rT3 can cause hypothyroid symptoms despite normal TSH and T4.
Common in chronic stress, caloric restriction, illness, and overtraining.
What It Measures
Concentration of inactive reverse T3 hormone.
Reference Ranges
| Status | Range (ng/dL) |
|---|---|
| Optimal | 9.2–24.1 ng/dL |
| Normal | 9.2–24.1 ng/dL |
| Borderline | > 24.1 ng/dL |
| Out of Range | > 30 ng/dL |
How GATOR Tracks This
Lab Providers
Function HealthLabCorp
Related Clinical Ratios
FT3/RT3
Related Biomarkers
This content is for informational purposes only and does not constitute medical advice. Reference ranges may vary by laboratory and individual factors. Consult a qualified healthcare provider for interpretation of your results and treatment decisions.
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