We stand behind our service
Go directly to the lab, no extra fees
With friendly doctor's notes & guidance
Lab visit as quick as 10 mins in & out
We stand behind our service
Go directly to the lab, no extra fees
With friendly doctor's notes & guidance
Lab visit as quick as 10 mins in & out
This test is ideal if you're experiencing persistent fatigue, unexplained weight gain, or feeling like your metabolism has slowed down despite normal thyroid test results. It measures Reverse T3, which can reveal hidden thyroid imbalances that standard thyroid tests might miss. Many people use this test when they have ongoing symptoms but their regular thyroid tests come back normal, or when dealing with chronic illness that affects how their body uses thyroid hormones.
No special preparation is needed for this test. You don't need to fast before your blood draw, and you can take your medications as usual. Simply visit a lab location at your convenience to have your blood sample collected.
This test measures Reverse T3 (rT3), an inactive form of thyroid hormone that can block the effects of active thyroid hormone when levels are too high. Elevated Reverse T3 is common during chronic illness, severe stress, or calorie restriction, and can explain why you feel hypothyroid symptoms even when standard thyroid tests appear normal. This measurement helps identify thyroid hormone conversion issues that affect your metabolism and energy levels.
What this means
Your Reverse T3 level is elevated above the optimal range, which suggests your body is converting more thyroid hormone into this inactive form. This can block your active thyroid hormone from working effectively, potentially explaining symptoms like persistent fatigue, difficulty losing weight, or feeling like your metabolism has slowed down.
Recommended actions
Focus on stress management through meditation, yoga, or deep breathing exercises
Ensure adequate selenium intake with Brazil nuts, eggs, and fish
Prioritize 7-9 hours of quality sleep and avoid extreme calorie restriction
Retest in 8-12 weeks after implementing lifestyle changes