Final answer:
The correct answer is E. Head CT scan. An initial workup for a patient with anorexia nervosa does not typically include a head CT scan, but rather focuses on physical exams and laboratory tests to evaluate medical consequences.
Step-by-step explanation:
The correct answer is E. Head CT scan. When conducting an initial workup for a patient with anorexia nervosa, a head CT scan is not typically necessary. Anorexia nervosa is primarily a psychological disorder characterized by a distorted body image and an intense fear of gaining weight. Therefore, physical exams and laboratory tests are used to evaluate the medical consequences of the disorder, such as electrolyte imbalances, abnormal thyroid function, and potential cardiac abnormalities.
For example, a complete blood count (A) can help assess any potential abnormalities such as anemia or infection. A Chem-7 (B) may assess electrolyte levels and kidney function. Thyroid function tests (C) can detect any abnormalities in thyroid hormone levels, which can contribute to changes in appetite and metabolism. Lastly, an electrocardiogram (D) can help assess any cardiac complications that may occur due to severe caloric restriction and weight loss.