Review Question - QID 109748

A 46-year-old African American woman presents to her primary care doctor complaining of muscle aches and weakness. She reports a 3 month history of gradually worsening upper and lower extremity pain. She is having trouble keeping up with her children and feels tired for most of the day. A review of systems reveals mild constipation. Her past medical history is notable for hypertension, diabetes, rheumatoid arthritis, and obesity. She takes lisinopril, metformin, and methotrexate. Her family history is notable for chronic lymphocytic leukemia in her mother and prostate cancer in her father. Her temperature is 99°F (37.2°C), blood pressure is 145/95 mmHg, pulse is 80/min, and respirations are 17/min. On exam, she appears well and in no acute distress. Muscle strength is 4/5 in her upper and lower extremities bilaterally. Patellar and brachioradialis reflexes are 2+ bilaterally. A serum analysis in this patient would most likely reveal which of the following?