A 21-year-old student presents with complaints of fatigue, headache, anorexia, and a runny nose, all of which began about 2 weeks ago.She started taking vitamins and over-the-counter cold preparations but feels worse.The smell of food makes her nauseated.Her boyfriend had mononucleosis about a month ago, and she wonders if she might have it also.Examination reveals cervical adenopathy and an enlarged liver and spleen.Which of the following labs would be most helpful in the differential diagnosis at this point?

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The Answer of A 21-year-old student presents with complaints of fatigue, headache, anorexia, and a runny nose, all of which began about 2 weeks ago.She started taking vitamins and over-the-counter cold preparations but feels worse.The smell of food makes her nauseated.Her boyfriend had mononucleosis about a month ago, and she wonders if she might have it also.Examination reveals cervical adenopathy and an enlarged liver and spleen.Which of the following labs would be most helpful in the differential diagnosis at this point?

A 21-Year-Old Student Presents with Complaints of Fatigue, Headache, Anorexia