A 46-year-old woman comes to the office due to a painful rash involving her groin and legs that has been worsening over 2 weeks. She was diagnosed with diabetes mellitus 6 months ago and has occasional loose stools. Physical examination shows coalescing erythematous plaques with crusting and scaling at the borders and central areas of brownish induration. Biopsy reveals superficial necrolysis. Which of the following laboratory abnormalities is most likely present in this patient?
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