QuestionSBA
QuestionChoice
High calcium in the blood should feedback to the parathyroids to stop producing PTH. As this feedback is not happening and PTH is excessively released, there must something causing this hyperparathyroidism. This is commonly caused by a parathyroid adenoma, but there may be secondary or tertiary hyperparathyroidism causing this.
10000824
d
Hypercalcaemia and raised parathyroid hormone
QuestionChoice
Hypercalcaemia in the blood will suppress PTH. Non-parathyroid malignancies or vitamin D excess may cause this finding.
10000822
b
Hypercalcaemia and reduced parathyroid hormone
QuestionChoice
Normocalcaemia may be found in vitamin D deficiency. However, this can only be the case if there is enough PTH to raise the calcium to normal.
10000825
e
Normocalcaemia and normal parathyroid hormone
QuestionChoice
Vitamin D is needed to absorb calcium from the diet. Without it, calcium in the blood is reduced. The parathyroid glands will sense this and release PTH into the bloodstream.
10000821
a
Hypocalcaemia and raised parathyroid hormone
QuestionChoice
Reduced calcium in the blood is sensed by the parathyroids, which should release PTH to increase calcium in the blood. However, because PTH is not being released in this finding, there must be an issue with the parathyroid. This could be due to a primary hypoparathyroidism from DiGeorge syndrome or post-thyroid surgery, for example.
10000823
c
Hypocalcaemia and reduced parathyroid hormone
Concept
Chapter
2693
3832
Vitamin D
Topic
167
Endocrine physiology
12711
A 35-year-old male comes to the GP with tiredness and bone aches.

Which blood results would support a diagnosis of vitamin D deficiency?
a