Parents of a 9-year-old child came to the dentist complaining that their child presents with enlarged cervical lymph nodes on the right. During examination palpation revealed the lymph nodes in the right submandibular, cervical, supraclavicular, and infraclavicular areas to be enlarged up to 2-2.5 cm in diameter, painless, non-matted together, and non-fused to the skin (resemble "potatoes in a sack"). The parents note rapid fatigability and night sweats in their child. What additional examinations should the child be referred for?