A 32-year-old patient reports painless swelling in the neck…

A 32-year-old patient reports painless swelling in the neck that has progressively increased over the past 3 weeks. The patient also complains of intermittent fevers, night sweats, and unexplained weight loss. On assessment, multiple enlarged, firm, non-tender lymph nodes are palpated in the cervical region. Which of the following is the nurse’s priority action?