Understand your thyroid function
‍at-home

Your brain's signal telling your thyroid how hard to work, and the first marker most doctors check. High TSH often means an underactive thyroid, linked to fatigue, weight gain, low libido, and fertility challenges. Low TSH can point to an overactive one.

The main hormone your thyroid produces, which your body converts into active T3. Low T4 can leave you tired, cold, and sluggish, while high levels can cause a racing heart, anxiety, and unexpected weight loss. Free T4 gives a more accurate read than total T4.

The active thyroid hormone that powers your metabolism, energy, mood, and muscle function. Stress, dieting, and long periods of eating too little can slow your body's conversion of T4 into T3, leaving you drained even when your other results look normal.

A sign your immune system is targeting your thyroid. Raised TPO antibodies are the hallmark of Hashimoto's, the most common cause of an underactive thyroid. They can appear years before your hormone levels change, giving you time to act early.