Blood collection at collection point
- You receive a test kit with tubes and referral letter
- Visit one of 800+ collection locations in the Netherlands
- Experienced staff professionally draw your blood
- Receive your results digitally by email
rT3 and FT3
Reverse T3 and free T3; supplementary thyroid diagnostics.
€85.00EUR
€20.00EUR
€5.95EUR
Costs are per order
- TrustPilot 4.6/5 sterren
- No GP referral needed
- Reviewed by BIG-registered physician
- ISO 15189 Certified laboratory
- Results within 1 week
- Order today, ships today
What are Reverse T3 (rT3) and Free T3 (FT3)?
Reverse T3 (rT3) is an inactive form of the thyroid hormone triiodothyronine (T3), produced as a byproduct of the normal metabolism of T3. Free T3 (FT3), in contrast, represents the active form of T3 that is available for use by the body. Together, these biomarkers provide important information about thyroid function and metabolism.
Why should you test Reverse T3 (rT3) and Free T3 (FT3)?
Testing both rT3 and FT3 is useful for a more comprehensive assessment of thyroid function, especially in cases where patients exhibit symptoms of thyroid abnormalities, but standard tests do not offer a clear diagnosis. This test is particularly helpful for distinguishing between different types of thyroid dysfunction and for optimizing treatment.
What does it indicate?
The ratio between rT3 and FT3 helps assess thyroid activity and metabolism. An imbalance may indicate a condition, such as conversion disorder, where the body has difficulty converting T4 to the active form T3, or "Low T3 Syndrome".
What does a high rT3 level or low FT3 level mean?
A high rT3 level combined with a low FT3 level may indicate decreased thyroid function or a body reaction to stress, illness, or malnutrition. This may point to the necessity of further evaluating thyroid function and potentially adjusting the treatment strategy.
What does a low rT3 level or high FT3 level mean?
A low rT3 level together with a high FT3 level may indicate hyperthyroidism or an overactive thyroid. This requires further evaluation and possible adjustment of treatment to normalize thyroid function.
