My free T3 (liothyronine) is low but all other tests normal. What does this mean?

Probably nothing. Are you taking thyroid replacement? A normal TSH usually means all is ok. See a thyroidologist.
Stress. Low free t3 (liothyronine) often correlates with adrenal stress/fatigue or low temperature syndrome. Checking your reverse t3 (liothyronine) level can help. A high reverse t3 (liothyronine) is suggestive of this diagnosis. Also, check your temperature orally several times during the day and if the average is lower than normal, this can be indicate low t3 (liothyronine) syndrome. Treatment involves getting to the root of the problem and reducing stress.

Related Questions

Low free t3, (liothyronine) normal TSH and high tpo antibodies. What's this mean?

Probable hypothyroid. The free t4, not free T3 (liothyronine) test, is necessary here. Positive antibodies indicate hashimoto's thyroiditis, the most common cause of hypothyroidism. It may just be early in the process to cause the TSH to be elevated. Read more...

Low body temperature 1wk+ 35.6c-36c, night sweats t3 (liothyronine) t4 test normal, WBC 11.6 giga/L, neutrophils 7.7 giga/L. History of hashimotos. Cause?

Too little info. Go to a good local doc and have him take a good and thorough history and a really good physical exam. That is the key to doing good medicine. That will help guide you to an answer to your problems. Read more...

Free T4 is in high lab range and free T3 (liothyronine) is low lab range. Does this mean I have a conversion problem? I'm 12 weeks pregnant. What should I do?

TSH? Diagnosis? The endocrine society, which is the society of endocrinologists, experts in hormones, recommends treatment of women with hypo or hyperthyroid in pregnancy. You didn't provide your tsh, which is an important marker to determine treatment. Some thyroid markers are similar to hormone of pregnancy, and thus, tx in pregnancy may differ. Resubmit your question with TSH and your diagnosis for help. Read more...