Review Question - QID 212366

A 22-year-old woman presents to her primary care provider complaining of a facial rash. She says the rash began 3 weeks ago after hiking in the White Mountains of New Hampshire this summer. Since that time she has also experienced pain in her hands and wrists that is worse in the morning and accompanied by subjective fevers. She denies chest pain, shortness of breath, nausea, or vomiting. Vital signs are 99.6°F (37.6°F), blood pressure is 134/82 mmHg, pulse is 88/min, and respirations are 18/min. Examination demonstrates a rash on the patient's face that spares the nasolabial folds along with oral ulcers. The metacarpophalangeal joints are tender to palpation, and range of motion is limited by pain. Complete blood count demonstrates normocytic anemia with thrombocytopenia. Which of the following is the next best step in diagnosis?