1. Thyroid Case Studies: 1 A 56 year old woman in a pre-comatose state with a temperature of 34C and an enlarged thyroid gland. Hb - 10.2 g/dL, MCV- 105 fL Na - 121 mmol/L, cholesterol - 350 mg/dL, LD - 380 U/L, ALT - 38 U/L, AST- 70 U/L, CK - 650 U/L

2. Thyroid Case Studies: 2 A 60 year old woman recovering from an acute myocardial infarction is suspected of being hypothyroid. She is on the following medications: digoxin, prednisone and lasix. TSH - 0.2 μU/mL, FT4 - 1.5 ng/dL, T3 - 130 ng/dL

3. Thyroid Case Studies:3 A 28 year-old 3 months post-partum patient with signs and symptoms of hyperthyroidism including a smooth enlargement of the thyroid gland TSH - <0.1μU/mL, FT4 - 3.5 ng/dL T3 - 500 ng/dL, 24h RAI - <2 percent

4. Thyroid Case Studies: 4 A 50 year old woman undergoing a routine physical examination TSH - 9uU/mL, FT4 - 1.0 ng/dL, antimicrosomal antibody titer - positive at a 1: 128 dilution

5. Thyroid Case Studies: 5 One month after the institution of replacement therapy ( 100 μg T4 daily) for primary hypothyroidism, a 46 year old man has the following test results: TSH - 50 μU/mL, FT4 - 1.5 ng/dL

6. Thyroid Case Studies: 6 Three months after the institution of T4 replacement therapy in a 55 year old woman, the following values are obtained: TSH - 30 μU/mL, FT4 - 3.0 ng/dl

7. Thyroid Case Studies: 7 A 33 year old woman on oral contraceptive therapy is investigated for suspected hypothyroidism. TSH - 20 μU/mL, FT4 - 1.5 ng/dL, Total T4 - 14 μg/dL, Repeat TSH - 22 μU/mL Repeat TSH (using an alternative technique) - 3.0 μU/mL