Free thyroxine 9.35 pmol/L is usually abnormal. Free thyroxine is normally between 11.5 and 22.7 pmol/L, while free thyroxine 9.35 pmol/L is relatively low. Free thyroxine is a kind of thyroxine synthesized and secreted by the follicular epithelial cells of the thyroid gland. It is one of the tests in the thyroid function test and is mainly used to determine the function of the thyroid gland. The normal value of free thyroxine ranges from 11.5 pmol/L to 22.7 pmol/L. Free thyroxine of 9.35 pmol/L is not within the normal range and is considered low. Lower free thyroxine can be seen in hypothyroidism, mucous edema, advanced Hashimoto’s thyroiditis, and the use of antithyroid medications. Low free thyroxine is recommended to go to the hospital in time to confirm the diagnosis, under the guidance of the doctor for standardized treatment.