Which condition is defined as deficient production of parathyroid hormone?

Hypoparathyroidism is defined as a condition in which there is insufficient production of parathyroid hormone (PTH). This hormone, produced by the parathyroid glands, is crucial for regulating calcium and phosphorus levels in the body. When the production of PTH is deficient, it leads to low levels of calcium in the blood, a condition known as hypocalcemia. This imbalance can result in various symptoms, such as muscle cramps, tingling sensations, and potentially more severe complications if not addressed.

The other options represent different conditions unrelated to the direct production of parathyroid hormone. Goiter is primarily associated with thyroid hormone issues and signifies an enlargement of the thyroid gland. Graves disease is an autoimmune disorder that leads to the overproduction of thyroid hormones, leading to hyperthyroidism. Renal calculus, commonly known as kidney stones, pertains to the formation of crystalized minerals in the kidneys and is not related to parathyroid hormone production. Thus, the definition of hypoparathyroidism aligns specifically with the deficient production of PTH.