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 20-year-old woman is brought to the emergency department 6 hours after the onset of colicky lower abdominal pain that has been progressively worsening. The pain is associated with nausea and vomiting. She has stable inflammatory bowel disease treated with 5-aminosalicylic acid. She is sexually active with her boyfriend and they use condoms inconsistently. She was diagnosed with chlamydia one year ago. Her temperature is 38.1°C (100.6°F), pulse is 94/min, respirations are 22/min, and blood pressure is 120/80 mm Hg. Examination shows right lower quadrant guarding and rebound tenderness. The remainder of the examination shows no abnormalities. Which of the following is the most appropriate next step in management?
assistant
Serum β-hCG concentration