TSH is your brain’s signal to the thyroid, helping spot under- or overactive thyroid function.
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Clinicians order TSH to check how well your thyroid is working, especially if you have symptoms like fatigue, weight changes, or palpitations. It also helps monitor thyroid treatment and adjust dose. During pregnancy or when planning one, TSH helps ensure thyroid levels support parent and baby. You can test this marker with Aniva across Germany and Finland.
Clinicians order TSH to check how well your thyroid is working, especially if you have symptoms like fatigue, weight changes, or palpitations. It also helps monitor thyroid treatment and adjust dose. During pregnancy or when planning one, TSH helps ensure thyroid levels support parent and baby. You can test this marker with Aniva across Germany and Finland.
High: May suggest an underactive thyroid or that thyroid medicine is too low. Certain medicines, recovery from illness, and thyroid antibody activity can also raise TSH.
Low: May suggest an overactive thyroid or that thyroid medicine is too high. Steroids, dopamine-like drugs, and high thyroid hormone levels can lower TSH. If results are unexpected, recheck and add Free T4; after changing thyroid medication, retest in about 6 weeks.
Common factors that can skew TSH include recent dose changes of thyroid medication, high-dose biotin supplements, acute illness, strenuous exercise, and time of day. Certain drugs can shift TSH, such as steroids, amiodarone, lithium, dopamine agonists, and heparin. Pregnancy changes TSH targets. Assay interference from supplements or antibodies is uncommon but possible.
Special situations: confirm or adjust interpretation in pregnancy, pituitary disorders, severe illness, or when results do not fit symptoms.
What does a high or low TSH mean? High TSH often points toward an underactive thyroid. Low TSH often points toward an overactive thyroid or overtreatment.
Do I need to fast for this test? No. You can test TSH without fasting. Try to test at a similar time of day.
What can affect my TSH result? Thyroid medicines, steroids, dopamine-like drugs, biotin supplements, illness, and pregnancy can shift results. Tell your clinician about all meds and supplements.
How often should I test TSH? If stable on treatment, many people test every 6–12 months. After a dose change, recheck in about 6 weeks.
How long do results take? Most labs report TSH within 1–3 days.
What should I discuss with my clinician? Share symptoms, medications, supplements, and pregnancy plans. Ask if you also need Free T4, Free T3, or thyroid antibodies.
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