What lab test would likely show high levels in a patient with a pituitary tumor causing Cushing Syndrome?

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In a patient with a pituitary tumor causing Cushing Syndrome, high levels of ACTH (Adrenocorticotropic Hormone) would be expected. This is due to the fact that Cushing Syndrome can result from an overproduction of cortisol, and in the case of a pituitary tumor, it is often due to an excessive secretion of ACTH by the tumor itself.

The increased ACTH stimulates the adrenal glands to produce more cortisol, leading to the symptoms associated with Cushing Syndrome, such as weight gain, hypertension, and glucose intolerance. Thus, measuring ACTH levels can help confirm the diagnosis, as an elevated level suggests that the pituitary gland is producing more of the hormone than normal.

In contrast, free T4 levels pertain to thyroid function and are not directly involved in the mechanisms of Cushing Syndrome. Insulin levels are mainly associated with glucose metabolism and diabetes, while electrolyte levels are important for assessing kidney function, hydration status, and various hormonal influences but do not specifically indicate the presence of a pituitary tumor or Cushing Syndrome. Therefore, the elevation of ACTH is a specific indicator of the disorder related to a pituitary tumor.

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