Complete Testing & Optimization Guide
Optimal ranges, provider comparison, and strategies to improve your T3 Uptake levels
Only 1 providers include this test
Thyroid Function
24-39%
Abnormal T3 Uptake levels can indicate underlying health issues that may go undetected without proper testing. Regular monitoring helps catch problems early when they're most treatable.
Understanding your T3 Uptake levels enables targeted interventions, tracks treatment effectiveness, and helps optimize your overall health and performance.
Measures thyroid hormone binding capacity
Reflects binding protein availability. Used with total T4 to calculate free thyroxine index. Less commonly used with free hormone assays available.
24-39%
| Provider | Includes Test | Annual Cost | Total Biomarkers |
|---|---|---|---|
 Superpower | ✓ | $199 | 100+ |
 WHOOP Advanced Labs | — | $349 | 65 |
 Labcorp OnDemand | — | $398 | 30+ |
| — | $486 | 40+ | |
| — | $468 | 83 | |
| — | $798 | 100+ | |
 InsideTracker | — | $680 | 48 |
 Function Health | — | $499 | 100+ |
| — | $900 | 70+ | |
| — | $1150 | 110 | |
| — | $Varies | 75+ |
Choose from 1 providers that include this biomarker in their panels
T3 Uptake is a thyroid function biomarker that Measures thyroid hormone binding capacity The normal reference range is 24-39%. Regular testing helps track changes and identify potential health issues early.
1 out of 10 major blood testing providers include T3 Uptake in their standard panels. These include Superpower.
For most people, testing T3 Uptake 2-4 times per year is recommended to establish baseline levels and track trends. If you have abnormal results or are actively working to optimize this biomarker, more frequent testing (quarterly) may be beneficial. Always consult with your healthcare provider for personalized testing frequency recommendations.
The standard laboratory reference range for T3 Uptake is 24-39%. However, many functional medicine practitioners recommend tighter "optimal" ranges for peak health and performance. Your ideal range may vary based on your age, sex, health goals, and other individual factors. Work with a healthcare provider familiar with optimal ranges to determine your target levels.
Most direct-to-consumer blood testing services that include T3 Uptake provide the physician order as part of their service. However, some states have restrictions on direct-to-consumer testing. Check with your chosen provider about availability in your state and whether they provide the necessary physician authorization.
Reflects binding protein availability. Used with total T4 to calculate free thyroxine index. Less commonly used with free hormone assays available.
This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider about your specific health needs and before making decisions about blood testing.
