General
TSH
Lab test

TSH

Recommended as a first-line screen for thyroid dysfunction and for routine monitoring in people on thyroid medication. Appropriate when symptoms like fatigue, weight changes, or mood shifts may be thyroid-related. No fasting required. Results are available within 2–4 days and reviewed by a General Medicine clinician.

Receive actionable insights and deep analysis—not just lab values– in as little as 48 hours

Clear guidance, and follow-up care available

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Most insurance accepted

Board-certified

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Available nationwide

What is a TSH Test?

The TSH test measures thyroid-stimulating hormone — the signal your pituitary gland sends to tell your thyroid how much hormone to produce. It's the most sensitive and widely used first-line marker for thyroid function, detecting both underactive and overactive thyroid before symptoms become severe and serving as the standard test for ongoing thyroid monitoring.

Hypothyroidism screening

An elevated TSH indicates the pituitary is working harder to stimulate an underperforming thyroid — associated with fatigue, weight gain, cold intolerance, brain fog, constipation, and hair thinning.

Hyperthyroidism screening

A suppressed TSH indicates the thyroid is producing too much hormone independently — associated with weight loss, rapid heartbeat, anxiety, heat intolerance, and sleep disturbance.

Thyroid medication monitoring

For people on levothyroxine or other thyroid medications, TSH is the essential marker for confirming that the current dose is keeping thyroid function in the optimal controlled range.

Complete insights in as little as 48 hours

1

Book your test

Instantly schedule at 2,000+ labs nationwide, at a time that works for you. Most visits take 15 minutes or less, with both walk-ins and appointments available.

2

Get results in 48 hours

Your results are delivered quickly—and reviewed by medical professionals. You’ll get clear explanations, robust health insights, and recommended next steps tailored to your health needs.

3

Take action with physician guidance

Choose to review your results and manage your plan with a General Medicine physician—or simply use the insights on your own.

4

Track progress over time

Repeat annually to see trends, improvements, and new emerging risks or book individual tests that focus on your set goals

All your care in one place. That’s the General Medicine difference.

We help you understand your options, connect you to the right clinicians, manage prescriptions, coordinate any needed evaluations, and keep an eye on your overall health along the way. It’s comprehensive care that looks at the full picture — your goals, your history, your lifestyle — and makes it simple to move forward with confidence.

Your care plan
Clinician

What's included

Test type

Blood sample

Collection method

Venipuncture

Fasting

Not required

Results processing time

1 to 2 days

TSH

Measures your thyroid-stimulating hormone levels, indicating how well your thyroid is controlling energy and metabolism.

Virtual visit with clinician

Ongoing support, always available.

You’ll be supported by experienced clinicians who care for a wide range of health needs, from everyday concerns to more complex conditions.

Our clinicians track your progress over time and adjust your care as needed. If medication is prescribed, we’ll manage dosing and monitor for side effects. If lab testing is recommended, we review results and refine your plan accordingly. You’re never left to navigate care on your own.

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Frequently asked questions

What does a TSH test measure?

TSH (thyroid-stimulating hormone) is produced by the pituitary gland and signals the thyroid to make more or less hormone. A high TSH suggests the thyroid is underactive (hypothyroidism); a low TSH suggests it's overactive (hyperthyroidism). It's the most sensitive first-line marker for thyroid disease.

Do I need to fast for a TSH test?

No fasting is required. TSH levels are not significantly affected by food intake. You can eat and drink normally before your appointment.

Should I take my thyroid medication before the test if I'm already on levothyroxine?

Current guidelines suggest taking your levothyroxine after the blood draw rather than before, as a recent dose can temporarily lower TSH and potentially misrepresent your stable controlled level. Take it as soon as possible after testing.

My TSH was normal but I still have symptoms — what does that mean?

A normal TSH doesn't rule out all thyroid-related issues. Some people have symptoms at levels within the reference range, or may have elevated thyroid antibodies (Hashimoto's) without an abnormal TSH yet. A clinician can review your result in context and determine whether Free T3, Free T4, or antibody testing is warranted.

How often should I have my TSH checked?

Once a year is typical for adults on thyroid medication or with known thyroid conditions. For people without known thyroid disease, TSH is often included in routine wellness panels. Testing more frequently is appropriate after a dose change or when new symptoms develop.
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