T3 Free High
T3 can be low if the conversion of T4 to T3 is blocked or diverted to RT3. If one is taking T3 as a medication, either as synthetic T3 (Cytomel brand or generic liothyronine), then malabsorption is another possibility.
T3 can be low if the conversion of T4 to T3 is blocked or diverted to RT3. If one is taking T3 as a medication, either as synthetic T3 (Cytomel brand or generic liothyronine), then malabsorption is another possibility.