Test library
TSH Test
The TSH Blood Test measures thyroid-stimulating hormone, the pituitary signal that controls thyroid activity. It is a first-line test for checking thyroid function and investigating symptoms of an overactive or underactive thyroid.
Order TSH Blood Test - Thyroid-Stimulating Hormone Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order TSH Blood Test - Thyroid-Stimulating Hormone Test- Typical turnaround
- 1-3 business days
- Starting price
- From $39
- Results
- Confidential, online
Quick answer
The TSH Blood Test measures thyroid-stimulating hormone in the blood. TSH is made by the pituitary gland and tells the thyroid how much hormone to produce. Because it responds to thyroid hormone levels, it is a sensitive first step when thyroid function is in question. Results are interpreted by a qualified healthcare provider.
What this test measures
The thyroid gland sits in the neck and produces hormones that influence metabolism, energy, heart rate, and body temperature. The pituitary gland monitors those hormone levels and adjusts TSH output to keep them in range. When thyroid hormone falls, TSH usually rises; when thyroid hormone is high, TSH usually falls.
The test requires a blood sample from a vein. TSH is often ordered together with free T4 and sometimes free T3 to build a complete picture of thyroid function. Because TSH changes slowly, a single result is usually interpreted alongside the person's symptoms and any previous thyroid results.
Clinicians request TSH testing to investigate fatigue, weight change, temperature sensitivity, palpitations, or other symptoms that could relate to the thyroid. It is also used to monitor people taking thyroid medication and to follow known thyroid conditions over time. The result alone does not diagnose a condition.
- Thyroid-stimulating hormone (TSH)
- Free thyroxine (free T4)
- Free triiodothyronine (free T3)
- Total T4
- Total T3
- Thyroid peroxidase antibodies (TPO)
- Thyroglobulin antibodies
- Reverse T3 when included
Why people order this test
- Screen for an underactive or overactive thyroid
- Investigate fatigue, weight change, or temperature sensitivity
- Monitor thyroid medication over time
- Follow a known thyroid condition
- Evaluate an abnormal thyroid result from another test
- Check thyroid function with a provider during pregnancy
How to prepare
No special preparation is usually needed, though some laboratories prefer a morning sample because TSH varies slightly during the day. If you take thyroid medication, follow the timing guidance provided by your healthcare provider and the laboratory.
Understanding your results
Results are generally available within one to three business days. A high TSH often suggests an underactive thyroid, while a low TSH can suggest an overactive thyroid, depending on the accompanying free T4. A qualified healthcare provider interprets the result with symptoms and other tests.
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Frequently Asked Questions
What does TSH measure?
TSH measures thyroid-stimulating hormone, which the pituitary gland releases to control thyroid hormone production. It is a common first test of thyroid function.
Should TSH be tested with other thyroid tests?
It is often ordered with free T4 and sometimes free T3. Measuring them together gives a clearer picture than TSH alone.
Do I need to fast for a TSH test?
Fasting is not usually required, though some laboratories prefer a morning collection. Thyroid medication timing is best confirmed with your healthcare provider.
Can a normal TSH still mean a thyroid problem?
TSH is sensitive but not perfect. Some thyroid conditions, and certain medications, can affect results, so a provider interprets TSH with symptoms and additional tests.
How often should TSH be checked?
The right interval depends on why the test is being done and whether a thyroid condition is being treated. A healthcare provider sets an appropriate schedule.
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