What critical result is seen in a patient with Addison's disease?

Addison's disease is characterized by the insufficient secretion of adrenal hormones, particularly corticosteroids, including cortisol and aldosterone. Patients with Addison's disease experience adrenal insufficiency due to damage to the adrenal glands, which results in low levels of corticoids. This can lead to symptoms such as fatigue, weight loss, low blood pressure, and hyperpigmentation of the skin.

The critical characteristic of Addison's disease is the hypo-function of corticoids secretion. This deficiency in hormone secretion can disrupt various bodily functions, leading to the associated clinical features of the disease.

In contrast, the other options do not accurately reflect the pathophysiology of Addison's disease. Low T3 and T4 levels pertain to thyroid dysfunction rather than adrenal issues. Elevated levels of cortisol would not be seen in Addison's disease but rather in conditions like Cushing's syndrome. High blood sugar levels are often a result of elevated cortisol, but in Addison's disease, the lack of cortisol generally leads to low to normal blood sugar levels.