Final Answer:
The client who has a decreased calcium level is most likely to have a manifestation of primary hyperparathyroidism. Option A is correct.
Step-by-step explanation:
In primary hyperparathyroidism, there is excessive secretion of parathyroid hormone (PTH) from the parathyroid glands, leading to increased levels of calcium in the blood. The parathyroid hormone acts on the bones, kidneys, and intestines to regulate calcium levels.
The correct answer is (a) the client who has a decreased calcium level. In primary hyperparathyroidism, elevated PTH levels lead to increased calcium reabsorption from the bones and decreased excretion by the kidneys. As a result, serum calcium levels rise. However, when interpreting lab results, it's crucial to understand the inverse relationship between calcium and phosphorus. In this case, a decreased calcium level suggests that there may be excessive excretion or inadequate absorption, consistent with primary hyperparathyroidism.
Furthermore, option (c) is incorrect because primary hyperparathyroidism is characterized by an increased, not decreased, parathyroid hormone level. Parathyroid hormone stimulates the release of calcium from the bones and enhances calcium reabsorption by the kidneys.
Therefore, decreased levels of parathyroid hormone would not align with the manifestation of primary hyperparathyroidism. Options (b) and (d) are unrelated to primary hyperparathyroidism and can be ruled out based on their lack of correlation with the disorder's characteristic features.