TSH
TSH (thyroid-stimulating hormone) is the signal your brain sends to the thyroid. When the thyroid is underactive, TSH goes up to push it harder; when it's overactive, TSH falls. That makes TSH the standard first test for thyroid problems.
Your reading
Labs use slightly different ranges, so Daygo shows the range printed on your own report. A high TSH suggests an underactive thyroid (hypothyroidism): tiredness, feeling cold, weight gain. A low TSH suggests an overactive one (hyperthyroidism): racing heart, weight loss, anxiety. Free T4 is usually checked next to confirm.
What may help
- —Testing at a similar time of day, since TSH is higher in the early morning
- —Pausing biotin supplements a few days before the test, as biotin can distort thyroid results
- —Making sure you get enough iodine and selenium through food, without high-dose supplements
When to talk to a doctor
If TSH is outside your lab's range, or normal but you have clear thyroid symptoms. Thyroid conditions are common and very treatable.
Common questions
What is TSH?
TSH (thyroid-stimulating hormone) is the signal your brain sends to the thyroid. When the thyroid is underactive, TSH goes up to push it harder; when it's overactive, TSH falls. That makes TSH the standard first test for thyroid problems.
What is a normal TSH level?
Daygo uses Your lab's range (commonly about 0.4–4.0 mIU/L) as the reference range. Labs use slightly different ranges, so Daygo shows the range printed on your own report. A high TSH suggests an underactive thyroid (hypothyroidism): tiredness, feeling cold, weight gain. A low TSH suggests an overactive one (hyperthyroidism): racing heart, weight loss, anxiety. Free T4 is usually checked next to confirm.
How can I improve my TSH?
Testing at a similar time of day, since TSH is higher in the early morning. Pausing biotin supplements a few days before the test, as biotin can distort thyroid results. Making sure you get enough iodine and selenium through food, without high-dose supplements.
When should I see a doctor about TSH?
If TSH is outside your lab's range, or normal but you have clear thyroid symptoms. Thyroid conditions are common and very treatable.
Source: MedlinePlus (NIH). Reference ranges are standard adult intervals — your own lab may report a different range for your age, sex, or method. This isn't medical advice; always go by the range on your actual results and talk to a clinician about anything that concerns you.