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Thyroid Function Testing: A Brief Update

Initial Diagnosis

Slide 10

April 2009

The downside is that, in some situations, such an exaggeration might not give us a good measure of the overall severity, because even a slightly severe thyrotoxicosis or hypothyroidism can give massive change in TSH. So, free T4 measurements are often used when either the TSH alone is not clearly diagnostic (ie, borderline measurements) or when there is some need to gauge the severity of hypo- or hyperthyroidism. Finally, there is the odd situation where total T3 measurement can also be helpful, and this is really those cases where both TSH and FT4 measurements are on the fence, or not clearly diagnostic.

Initial Diagnosis


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