Thyroid

Causes of ‘Confusing’ Thyroid Blood Work

  Normal Lab Testing Thyroid Function Tests (TFTs) are amongst the most commonly requested lab investigations (1). For most of the population, interpreting the lab work is fairly straightforward when we look at a combination of TSH, T4 and perhaps T3. As doctors, we learn to diagnose thyroid disease through a combination of clinical findings…

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Thyroid Basics 101: Anatomy, Physiology & Blood Work

This introductory article is one of many in-depth articles on thyroid function. This one will focus on: normal thyroid anatomy and physiology and the tests that are sometimes done to investigate thyroid health. Basic Physiology and Anatomy The most important anatomical structures are shown in Figure 1. The hypothalamus creates a hormone called thyrotropin-releasing hormone…

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Body Temperature and Pulse rate in Hypothyroidism

Prior to the current use of TSH (thyroid stimulating hormone) to assess thyroid function, doctors used much simpler, yet highly effective ways to grade thyroid function. Doctors in the 1940’s used signs and symptoms to make a working diagnosis and relied on basal metabolic rate to confirm the diagnosis. Basal body temperature, metabolism and heart…

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