Lab test
TSH Blood Test - Thyroid-Stimulating Hormone Test
This page explains the tsh blood test - thyroid-stimulating hormone test, what it measures, and how to order it. The TSH blood test measures thyroid-stimulating hormone levels to assess thyroid function.
What this test is
The TSH blood test evaluates the level of thyroid-stimulating hormone in the blood. This hormone is produced by the pituitary gland and helps regulate the thyroid gland's production of hormones. It can provide insights into thyroid function.
What it measures
- Thyroid-Stimulating Hormone (TSH) — reflects pituitary gland activity
What the test involves
A healthcare professional will collect a blood sample from a vein, typically in your arm. This standard blood draw is quick and usually takes only a few minutes.
Why it is often ordered
Clinicians typically order the TSH test to assess thyroid function or investigate symptoms related to thyroid disorders. It helps in evaluating conditions such as hyperthyroidism or hypothyroidism.
Preparation
Preparation instructions can vary, so it's important to follow the specific guidelines provided by the collection lab.
How results are reported
Results are reported as a numerical value indicating the TSH level in the blood. Reference ranges can vary between laboratories.
Before you go
- Test preparation requirements
- Sample collection procedure
- Turnaround time for results
FAQ
Frequently asked questions
What does a high TSH level indicate?
A high TSH level may suggest an underactive thyroid, known as hypothyroidism. However, interpretation depends on individual health factors.
Can medications affect TSH levels?
Yes, certain medications can influence TSH levels. It's important to inform your healthcare provider about any medications you are taking.
Is fasting required before a TSH test?
Fasting is not typically required for a TSH test, but follow any specific instructions from the lab conducting the test.
How often should TSH levels be checked?
The frequency of TSH testing depends on individual health needs and should be determined by a healthcare provider.
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Locations
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