Clinical Chemistry II, Quiz 18.

What is the diagnosis of a patient who has low calcium and high parathyroid hormone level?

Secondary hyperparathyoridism

Which of the following is not a cause of hypophosphatemia?

Vitamin D intoxication

Monitoring intraoperative PTH is useful for:

Surgical management of primary hyperparathyroidism.

Which hormone causes a rise in ionized calcium?

parathyroid hormone

An elevation in chloride in the presence of normal sodium and potassium is seen in

primary hyperparathyroidism.

Which of the following feedback mechanisms regulate the production of 1, 25(OH) 2D 3?

Negative feedback mechanism associated with circulating levels of calcium and inorganic phosphorus.

Which of the following is true regarding calcium homeostasis?

Low calcium stimulates release of 1,25 dihydroxyvitamin D.

The following results correlate with which of the following parathyroid disorders?

Secondary hyperparathyroidism

Which of the following laboratory tests are bone formation markers?

Osteocalcin and alkaline phosphatase

Which of the following is an effect of increased parathyroid hormone secretion?

Increased intestinal absorption of calcium

The serum calcium concentration is regulated by which of the following hormones?

parathyroid hormone

The following laboratory serum results were obtained: increased calcium, borderline low phosphate, normal alkaline phosphatase, and decreased PTH. These results are most compatible with which of the following parathyroid disorders?

Hypercalcemia of malignancy

Secondary hyperparathyroidism is often the result of which of the following conditions?

Renal failure

Which of the following results is inconsistent with a presumptive diagnosis of rickets?

High serum phosphate

A patient has an increased serum calcium level and a decreased serum phosphorus level. The PTH level is also increased. These results correlate with which of the following disorders?

Primary hyperparathyroidism

What is the overall effect of parathyroid hormone release?

Increase bone resorption of calcium

Hypercalcemia of malignancy is associated with increased levels of which of the following?

PTH-related protein

Board Review Question: Fasting serum phosphate concentration is controlled primarily by the

parathyroid gland

Board Review Question: Calcium concentration in the serum is regulated by

parathyroid hormone

Board Review Question: The regulation of calcium and phosphorus metabolism is accomplished by which of the following glands?

parathyroid gland

Which cell is encased into the bone?

osteocytes

Which of the following statements best illustrates the diagnostic criteria for primary hyperparathyroidism?

Detectable amounts of serum PTH concomitant with elevated total serum calcium

A(n) __________ deficiency causes bone disease in postmenopausal women.

estrogen