Which serum level is commonly found in primary hyperparathyroidism?

In primary hyperparathyroidism, there is an overproduction of parathyroid hormone (PTH) from the parathyroid glands, which leads to increased serum calcium levels. This condition is often due to a benign tumor (adenoma) or hyperplasia of the parathyroid glands. The excess PTH causes the bones to release more calcium into the bloodstream, enhances intestinal absorption of calcium, and decreases renal excretion of calcium, all contributing to elevated serum calcium levels.

While phosphate levels may vary in primary hyperparathyroidism, they are often normal or low due to the renal excretion promoted by the elevated PTH levels. However, the hallmark finding in primary hyperparathyroidism is indeed the increased serum calcium, which is essential for diagnosis and management of the condition. Thus, recognizing the typical increase in calcium helps in understanding the pathophysiological alterations occurring in this disorder.