QuestionSBA
QuestionChoice
This is a classical presentation of hyperthyroidism so is likely to have raised T3 and T4 levels.
10005965
e
Normal TSH and normal T3 and T4
QuestionChoice
This is the picture of secondary hypothyroidism. The decrease in thyroid hormones is in response to the lack of TSH which stimulates the release of thyroid hormones.

Under-production of TSH can be due to a non-secretory pituitary adenoma.
10005964
d
Low TSH and low T3 and T4
QuestionChoice
TSH is released by the anterior pituitary and stimulates the release of T3 (triiodothyronine) and T4 (thyroxine).

Primary hyperthyroidism originates from the thyroid gland itself which suppresses the release of TSH by negative feedback.

The main causes of hyperthryoidism include Graves' disease, toxic multinodular goitre and toxic adenoma.

Women are more at risk than men.
10005961
a
Low TSH and High T3 and T4
QuestionChoice
This is the picture of secondary hyperthyroidism. This is in response to the secretion of high levels of TSH which stimualates the release of thyroid hormones.

overproduction of TSH can be due to a pituitary adenoma.
10005962
b
High TSH and high T3 and T4
QuestionChoice
This is the picture of mild or early onset hypothyroidism.

The thyroid hormones are in normal ranges but TSH is released in greater quantities to help maintain these levels.

Treatment is required only if TSH is higher than >10mlU/L.
10005963
c
High TSH and normal T3 and T4
Concept
Chapter
2693
4461
Hyperthyroidism
Topic
167
Endocrine physiology
13739
A 20 year old female presents to the GP with irritability, palpitations, excessive sweating and weight loss with increased appetite.

Primary hyperthyroidism is suspected.

What would support this on the blood test?
a