system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 30-year-old woman comes to the physician because of a swelling on her neck for 5 months. It has gradually enlarged in size and is mildly painful. She has also had intermittent episodes of throbbing headache, sweating, and palpitations over the past 3 months. Menses occur at regular 28-day intervals and last for 4–5 days. She does not smoke, occasionally consumes alcohol on weekends. She appears thin and pale. Her temperature is 38.7°C (101.7°F), pulse is 112/min, and blood pressure is 140/90 mm Hg. Examination shows a firm, 3-cm swelling on the neck that moves with swallowing; there is no lymphadenopathy. Cardiopulmonary examination shows no abnormalities. Laboratory studies show:
Hemoglobin 13 g/dL
Leukocyte count 9500/mm3
Platelet count 230,000/mm3
Serum
Na+ 136 mEq/L
K+ 3.5 mEq/L
Cl- 104 mEq/L
TSH 2.3 μU/mL
Calcitonin 300 ng/dL (Normal < 5 ng/dL)
An electrocardiogram shows sinus tachycardia. Which of the following laboratory abnormalities is most likely to be seen?"
assistant
Increased plasma metanephrines