A 12-year-old finds herself feeling anxious and overwhelmed and seeks out the school nurse to report that "Everything is changing .. my body, the way the boys who were my friends are treating me, everything is so different." Which of the following is likely?

Choice A reason: Anorexia nervosa is characterized by significant weight loss (42 kg is very low for an adult), a preoccupation with food (cooking gourmet meals for others), and attempts to hide the body (wearing layered, loose clothing). These behaviors are classic indicators of the intense fear of weight gain seen in this disorder.

Choice B reason: Eating disorder not otherwise specified (now often categorized as OSFED) is used when a patient's symptoms cause significant distress but do not meet the full, strict criteria for Anorexia or Bulimia. This patient’s dramatic weight loss and specific behavioral patterns fit the primary diagnostic criteria for Anorexia Nervosa.

Choice C reason: Major Depressive Disorder can cause weight loss due to anorexia (loss of appetite). However, the specific behaviors of cooking elaborate meals for others while restricting one's own intake and wearing layered clothing to hide weight loss are specific to the psychopathology of an eating disorder rather than depression.

Choice D reason: Bulimia Nervosa involves episodes of binge eating followed by compensatory behaviors like purging. Patients with bulimia usually maintain a weight that is within or slightly above the normal range. The patient's extremely low weight of 42 kg and restrictive eating habits point toward the restrictive type of Anorexia.

Choice A reason: A serum potassium level of 3.4 mEq/L is slightly below the normal range (3.5 to 5.0 mEq/L). While it requires monitoring and likely oral supplementation, it is generally not considered an emergency threshold for acute hospitalization unless accompanied by cardiac arrhythmias or much more severe depletion (typically <3.0 mEq/L).

Choice B reason: A urine output of 40 mL/hr is within the normal expected range for an adult (minimum 30 mL/hr). This indicates that the patient’s kidneys are currently well-perfused and they are likely not experiencing severe dehydration or acute renal failure, which would be reasons to consider inpatient medical stabilization.

Choice C reason: A blood pressure of 100/60 mm Hg is relatively low but may be normal for many young, thin individuals or athletes. Without symptoms of orthostatic hypotension or evidence of end-organ hypoperfusion, this reading alone does not meet the strict medical stability criteria for admission to an inpatient eating disorder unit.

Choice D reason: A blood pressure of 78/58 mmHg is severely hypotensive and indicates a state of medical instability. In patients with eating disorders, profound hypotension combined with a low or borderline pulse rate suggests a high risk of cardiovascular collapse. This meets the APA criteria for immediate hospitalization to stabilize vital signs and prevent death.