TRIIODOTHYRONINE T3 REVERSE

The TRIIODOTHYRONINE T3 REVERSE (rT3) test measures reverse triiodothyronine — an inactive metabolite produced from thyroxine (T4) — to evaluate how the body converts and metabolizes thyroid hormones. Measuring rT3 helps distinguish between true hypothyroidism and disrupted peripheral conversion (for example, during illness, stress, or calorie restriction) and can explain persistent symptoms when standard thyroid markers appear normal. This service offers accurate serum measurement via at‑home blood collection with fast sample pickup across Dubai and the UAE, processed by UAE‑accredited laboratories for reliable reporting.

The rT3 test is recommended when patients have fatigue, weight changes, cognitive slowing or other hypothyroid symptoms despite normal TSH or free T4, or when clinicians suspect euthyroid sick syndrome or altered deiodinase activity. Results assist physicians in refining diagnosis and management—whether adjusting thyroid hormone therapy, investigating metabolic causes, or monitoring recovery after severe illness—however interpretation should always be done by a qualified healthcare professional in the UAE.

Sample requirements, timing, and certain medications can influence rT3 results; typical at‑home collection is by venous blood draw and does not usually require prolonged fasting, but timing relative to thyroid medication matters. Turnaround times vary by lab but are typically available within 24–72 hours; the report will include the measured rT3 value alongside reference ranges and guidance to review findings with your physician before making treatment decisions.

• Reverse Triiodothyronine (rT3)
• Free Triiodothyronine (fT3)
• Free Thyroxine (fT4)
• Thyroid Stimulating Hormone (TSH)
• Total Triiodothyronine (Total T3)

• Persistent hypothyroid symptoms despite normal TSH or fT4
• After serious illness, surgery, or critical care (suspected euthyroid sick syndrome)
• Unexplained fatigue, weight changes, or slowed metabolism
• When assessing peripheral thyroid hormone conversion or deiodinase dysfunction
• Monitoring response to thyroid hormone therapy or dose adjustments

• Clarifies peripheral thyroid hormone conversion and metabolic status
• Helps differentiate true hypothyroidism from illness‑related hormone changes
• Convenient at‑home phlebotomy with fast pickup across Dubai and the UAE
• Results processed by UAE‑accredited labs for reliable reporting
• Supports clinician decision‑making for tailored thyroid management

• At‑home venous blood sample collection by trained phlebotomist
• No prolonged fasting usually required; follow specific instructions from the lab
• Inform the collector about all medications and supplements (timing of thyroid meds may need adjustment)
• Consult your physician before stopping or changing any thyroid medication