Reverse T3

Inactive form of thyroid hormone that blocks T3

4/22Providers
Thyroid FunctionCategory
9.2-24.1 ng/dLReference

Limited Availability

4 providers include this

Category

Thyroid Function

Reference Range

9.2-24.1 ng/dL

What is Reverse T3?

Inactive form of thyroid hormone that blocks T3

Why It Matters

Elevated during stress, illness, or caloric restriction. High levels despite normal TSH/T4 may explain persistent fatigue and metabolic issues. Indicates thyroid hormone conversion problems.

Reference Range: 9.2-24.1 ng/dL

Which Providers Test Reverse T3?

Function
Included in panel
Marek Complete
Included in panel
Marek Exec.
Included in panel
Vitality Elite
Included in panel

Full Provider Comparison

ProviderIncludesAnnual CostBiomarkers
Superpower—$199100+ (150 with ratios)
WHOOP Advanced Labs—$34965
Labcorp OnDemand—$39830+
Life Extension—$48640+
Everlywell—$46883
Mito Health—$349100+
InsideTracker—$68048
Function Health✓$499100+
Marek Health Base—$25045+
Marek Health Comprehensive—$49570+
Marek Health Complete✓$895100+
Marek Health Executive✓$1950150+
Blueprint Advanced—$1150110
Quest Health—$Varies75+
Empirical Health—$19085+
Oura Health Panels—$9950
SiPhox Health—$12560
Hims Labs Base—$19950
Hims Labs Advanced—$499120+
Healthspan—$34980+
Vitality Blueprint Standard—$37585
Vitality Blueprint Elite✓$700129

Ready to Test Reverse T3?

4 providers include this biomarker in their panels

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Frequently Asked Questions

What does Reverse T3 test for?
Reverse T3 is a thyroid function biomarker. Inactive form of thyroid hormone that blocks T3 The normal reference range is 9.2-24.1 ng/dL.
Which providers include Reverse T3?
4 of 22 providers include this test:Function, Marek Complete, Marek Exec., Vitality Elite.
How often should I test Reverse T3?
For most people, testing 2-4 times per year is recommended to establish baseline levels and track trends. Consult your healthcare provider for personalized recommendations.
What is the optimal range?
The standard reference range is 9.2-24.1 ng/dL. Many functional medicine practitioners recommend tighter optimal ranges for peak health. Your ideal range may vary based on age, sex, and health goals.
Why is Reverse T3 important?
Elevated during stress, illness, or caloric restriction. High levels despite normal TSH/T4 may explain persistent fatigue and metabolic issues. Indicates thyroid hormone conversion problems.

Medical Disclaimer

This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider about your specific health needs.