MAJOR THYROID HORMONES

Question 1

• it is METABOLICALLY ACTIVE FORM of thyroid hormones

Answer 1

Triiodothyronin / 3,5,3 Triiodothyronin

Question 2

• Its principal application is in the DIAGNOSIS OF T3 THYROTOXICOSIS

Answer 2

Triiodothyronine

Question 2

• It is the BETTER indicator of recovery from the HYPERTHYROIDISM as well as its RECURRENCE

Answer 2

Triiodothyronine

Question 3

• Helpful in the DIAGNOSIS OF HYPERTHYROIDISM especially in patient with NO or ELEVATED T4

Answer 3

Triiodothyronine

Question 4

• An increase of T3 in plasma is first abnormally seen in.

Answer 4

Hyperthyroidism

Question 5

Testing
- Immunoassay
80 - 200 mg/dL

Answer 5

Triiodothyronine

Question 6

• It is the PRINCIPAL SECRETORY PRODUCT of thyroid gland

Answer 6

Tetraiodothyronine / 3,5,3’,5’ Tertaiodothyronine

Question 7

• It is completely synthesized in the thyroid gland

Answer 7

Tetraiodothyronine

Question 8

• It has the MAJOR FRACTION of organic iodine in the circulation

Answer 8

Tetraiodothyronine

Question 9

• Plasma concentration is a GOOD INDICATOR of the thyroid secretory rate

Answer 9

Tetraiodothyronine

Question 10

• T4 is converted to T3 in the peripheral tissue

Answer 10

Tetraiodothyronine

Question 11

Reference range

Answer 11

• Adult: 5.5 - 12.5 ug/dL
• Neonates: 11.8 -22.6 ug/dL

Question 12

Testing
- Immunoassay

Answer 12

Tetraiodothyronine

Question 13

FT4 Reference range

Answer 13

• 0.9 to 2.3 ng/dL