They suspected their patient might be suffering from low levels of thyroid hormone because the 54-year-old woman reported weight gain and lethargy. This time, her thyroid hormone levels were within the normal range. The patient's thyroid hormone levels were not high at all. The patient's thyroid hormone levels were not high at all. The patient had been taking high levels of biotin, and the lab test was sensitive to biotin interference.

Source: CBC News March 12, 2019 08:02 UTC