Thyroid Flashcards
(13 cards)
How often should you check TSH after starting thyroxine?
Monthly
When can you check TSH and T4 at same time?
When managing established thyroid disease.
Which TFT is Medicare rebate-able for initial Ix?
TSH.
What is sick euthyroid syndrome?
T4 or T3 at abnormal levels with a seemingly normal thyroid gland. Can be from trauma, starvation, serious illness - seen in ICUs. THS, T4 and T3 can all be normal or reduced.
What happens with T3 levels in thyroid disorders?
Normal or decr in hypothyroidism (primary and pit dysfn) and in sick euthyroid syndrome.
Increased in hyperthyroidism
What happens with T4 in thyroid disorders?
Decreased in hypothyroidism (primary and pit dysfn)
Increased in hyperthyroidism
Normal or decr in sick euthyroid syndrome
What happens to TSH in thyroid disorders?
Increased in primary hypothyroidism
Decreased in hyperthyroidism
Decreased or normal in secondary (pituitary dysfn) and sick euthyroid syndrome
What happens with T3 levels in thyroid disorders?
Normal or decr in hypothyroidism (primary and pit dysfn) and in sick euthyroid syndrome.
Increased in hyperthyroidism
What happens with T4 in thyroid disorders?
Decreased in hypothyroidism (primary and pit dysfn)
Increased in hyperthyroidism
Normal or decr in sick euthyroid syndrome
What happens to TSH in thyroid disorders?
Increased in primary hypothyroidism
Decreased in hyperthyroidism
Decreased or normal in secondary (pituitary dysfn) and sick euthyroid syndrome
What effect can amiodarone have on thyroid?
It contains about 37% iodine by weight and can cause both thyrotoxicosis and hypothyroidism
What are thyroid peroxidase antibodies diagnostic of?
Hashimoto’s.
Less commonly, other forms of thyroiditis such as Grave’s and post-partum
What are thyroglobulin antibodies found in?
When is thyroglobulin routinely measured?
Thyroglobulin used to be called colloid. Antibodies to it are found Hashimotos > Grave’s
Monitor cancer recurrence in those with thyroidectomy
