American Board of Psychiatry and Neurology (ABPN) Practice Exam

In the context of evaluating a patient with anorexia nervosa, initial workup typically includes tests that help assess the patient's overall health and identify any medical complications associated with the disorder. Complete blood count, Chem-7 (which measures electrolytes and renal function), and thyroid function tests are all relevant for monitoring physiological changes, nutritional status, and ruling out other potential medical causes for the eating behavior.

On the other hand, a head CT scan is not routinely performed during the initial workup for anorexia nervosa. This imaging study is generally reserved for specific clinical signs or symptoms such as neurological deficits, unexplained severe headaches, or other concerning features that might suggest intracranial pathology. In the absence of such indications, a head CT scan does not provide useful information applicable to the diagnosis or immediate management of anorexia nervosa. Therefore, it is unnecessary as part of the initial assessment for this psychiatric condition.