Quick Facts
- Sample: Blood
- Fasting: No special preparation is required
- Turnaround: 1-2 business days (may take longer based on weather, holiday, or lab delays)
What This Test Measures
This test measures total Tri-iodothyronine (T3), also known as Total T3, a thyroid hormone that helps regulate your metabolism. T3 plays a key role in controlling how your body converts oxygen and calories into energy, and it influences body temperature, heart rate, and overall metabolic rate.
This is a total T3 measurement, meaning it reflects the combined amount of T3 circulating in your blood, both bound to proteins and unbound. Your provider may use this result, along with other clinical information, to evaluate thyroid gland function.
Benefits
- Measures total T3, a key thyroid hormone
- Supports evaluation of thyroid gland function
- Can help identify signs of hyperthyroidism
- Useful for monitoring known thyroid conditions
- Convenient blood test with no fasting required
- Fast turnaround for timely results
Who Is This Test For?
- People experiencing symptoms associated with hyperthyroidism
- Individuals with a confirmed thyroid condition needing monitoring
- People with unexplained fatigue, weight changes, or rapid heart rate
- Individuals with anxiety, hand tremors, or heat sensitivity
- People noticing hair loss or changes in skin or eyes
- Anyone advised by a healthcare provider to check thyroid hormone levels
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What is the purpose of this thyroid test?
This test measures total Tri-iodothyronine (T3), a thyroid hormone involved in regulating metabolism, body temperature, and heart rate. It may help a healthcare provider evaluate thyroid gland function and identify signs of hyperthyroidism. This test does not diagnose a condition on its own.
2. When might I consider ordering this test?
You may consider this test if you have symptoms associated with thyroid changes, such as rapid heart rate, anxiety, fatigue, weight changes, hand tremors, or increased sensitivity to heat or cold. It may also be appropriate for ongoing monitoring of a confirmed thyroid condition or when recommended by your healthcare provider.
3. How does this test differ from other thyroid tests?
This test measures total T3, including bound and unbound hormone. It provides different information from a Free T3 test and does not measure thyroid antibodies, binding proteins, calculated indexes, TSH, or T4.
4. Do I need to fast or prepare before this test?
No special preparation is required.
5. How quickly will I get results?
Results are typically available in 1–2 business days. Weather, holidays, or laboratory delays may extend this timeframe.
6. How do I interpret the results?
The meaning of your total T3 result depends on your symptoms, medical history, medications, and other laboratory findings, such as TSH or T4 levels. Results are often considered alongside other thyroid measurements for a fuller picture of thyroid function. An abnormal result does not automatically confirm a thyroid condition, and a normal result does not automatically rule one out.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
7. What should I do if my result is outside the expected range?
Review your result with a qualified healthcare provider. They can determine whether further evaluation or testing is appropriate based on your health history and symptoms. Do not interpret or act on abnormal results without professional guidance.
8. How often should I get tested?
Testing frequency depends on your symptoms and health history. Follow your healthcare provider’s guidance, as there is no standard repeat-testing schedule for this test.
Pre test preparation
No special preparation is required before this test.
