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Thyroid Blood Tests: When to Take Thyroid Medication, Fasting, and More

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Updated June 04, 2014

Thyroid Blood Tests: When to Take Thyroid Medication, Fasting, and More

A question I get asked regularly is whether or not doctors recommend that we take our thyroid medicine the day we are getting blood tests. And should we fast the night before thyroid tests? And does it matter whether we have tests in the morning, or in the afternoon? I've put together the answers in this piece on Optimum Time and Conditions for Thyroid Blood Tests. Also, learn about how TSH samples can degrade over time, in this article that talks about Capillary Fingerprick / Blood Spot Tests.

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