Thyroid testing has come a long way in the past 50 years. The tests discussed here should help you sort out most thyroid problems. TSH is now the first-line test in evaluating patients suspected of having thyroid dysfunction and in thyroid screening. FNAB is the first-line test in evaluating most thyroid nodules. The other tests reviewed in this chapter are useful in specific patients. The problem of nonthyroidal illness in acutely ill patients is often difficult to sort out, but the points listed here should be helpful.

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