Thyroid Labs

Question 1

Primary Hypothyroidism: Thyoid

Answer 1

-T3/T4: Decreased
-T3U: Decreased
-TSH: Increased

Question 2

Secondary Hypothyroidism: Thyroid

Answer 2

-T3/T4: Decreased
-T3U: Decreased
-TSH: Decreased

Question 3

Hyperthyroid/Graves’ Disease: Thyroid

Answer 3

-T3/T4: Increased
-T3U: Increased
-TSH: Decreased

Question 4

Euthyroid Goiter: Lab Findings

Answer 4

-T4 & T3U normal
-TSH increased
-Thyroid antibodies should be ordered to rule out Hashimoto’s Thyroiditis

Question 5

Subacute Granulomatous Thyroiditis: Lab Findings

Answer 5

-ESR/CRP elevated
-T4 increased
-WBC normal or decreased
-Anti-thyroglobulin anibodies may be present

Question 6

Hashimoto’s Thyroiditis: Lab Findings (Early)

Answer 6

-Normal T4 & TSH
-High levels of TPO antibodies

Question 7

Hashimoto’s Thyroiditis: Later

Answer 7

-Low T3/T4
-High TSH
-Positive TPO antibodies

Question 8

Hashitoxicosis: Lab Findings

Answer 8

-Low TSH
-High T3/T4
-Positive TPO antibodies

Question 9

What makes “Silent” Lymphocytic Thyroiditis unique is:

Answer 9

No thyroid antibodies

Question 10

Thyroid Neoplasms: Lab Findings

Answer 10

• Thyroid function tests usually normal
• Hormone levels normal

Question 11

Subclinical Hyperthyroidism: Lab Findings

Answer 11

-Low TSH
-Normal T3/T4 levels

Question 12

Hashimoto’s Thyroiditis: Cholesterol

Answer 12

Elevated if Hypothyroidism

Question 13

Hashimoto’s Thyroiditis: Cholesterol

Answer 13

Elevated if Hypothyroidism

Question 14

Subclinical Hypothyroidism: Lab Findings

Answer 14

-High TSH
-Normal Free T3/T4 levels
-TPO antibodies should be measured in all cases

Question 15

Hyperthyroid/Grave’s Disease: Antibodies

Answer 15

-Thyroid Stimulating Immunogloblin (TSI)*, and TSH Receptor Antibodies
-Possible: TPO, Thyroglobulin