Which of the following tests is NOT included in endocrine function tests?

The blood lipid profile is not included in endocrine function tests because it primarily assesses the levels of lipids, such as cholesterol and triglycerides, in the blood. This test is primarily used to evaluate cardiovascular health and risk for heart disease rather than to assess hormonal function or identify disorders related to the endocrine system.

In contrast, tests for the thyroid gland, cortisol levels, and prolactin levels specifically measure hormones or their effects within the body and are crucial for diagnosing and monitoring various endocrine disorders. Thyroid gland tests evaluate thyroid hormone production, cortisol blood tests are used to assess adrenal function and stress responses, and prolactin tests help in diagnosing conditions related to pituitary gland function. Each of these tests is directly related to hormone levels and their regulation, solidifying their status within the category of endocrine function tests.