Vettester Chris
Super Moderator
On the thyroid side, look close at the labs and notice how low the FT4 lab is compared to the FT3 lab; based on where they sit in relation to the reference range. FT4 hovers in the 20% range, FT3 in the 50% range. The first suspicion I have is that FT3 is struggling to get into the body, so T4 shifts course and increases conversion to Reverse T3. So of course the missing link is Reverse T3. Elevated and/or low ratios of Reverse T3 is usually a marker for other issues, pointing towards areas like the adrenals, iron, electrolytes, and/or injury, sickness, or situations where your body needs to conserve energy and ATP.