Function Tests: Endocrine Function: Thyroid Function and Tests

Question 1

What do thyroid hormones influence? (3)

Answer 1

1. metabolic rate
2. growth
3. differentiation of body cells

Question 2

What thyroid problem is this?

1. Is common in dogs, horses, ruminants, and swine
2. In young animals - dwarfism (cretinism)
3. Affects all systems in the body
4. Decreased metabolism, lethargy, hair loss, weight gain, edema, reproductive failure

Answer 2

Hypothyroidism

Question 3

What thyroid problem is this?

1. Increased metabolism, weight loss with normal or increased appetite
2. Irritability, nervousness

Answer 3

Hyperthyroidism

Question 4

Routine T4 tests measure both protein bound and free T4.

___ % of circulating T4 is bound.

Answer 4

99%

Question 5

What does the TSH Response Test determine?

Answer 5

normal vs. abnormal thyroid

Question 6

What is the TSH Response Test mostly used for?

Answer 6

hypothyroid dogs/animals

Question 7

What is the protocol for TSH Response Test? (3)

Answer 7

1. Baseline T4
2. TSH IV (4-6 hours)
3. Measure T4

Question 8

When should you see an increase in T4 during the TSH Response Test?

Answer 8

normal animals

Question 9

What should you see when you have a hypothyroid animal taking the TSH Response Test?

Answer 9

should see no increase in T4

Question 10

What will you see in a hyperthyroid animal taking the TSH Response Test?

Answer 10

little to no increase in T4

Question 11

What is diagnosed by

1. clinical signs
2. increased baseline T4
3. lack of TSH Response

Answer 11

hyperthyroidism