In a child with recurrent otitis media, which test should be ordered?

• A. CBC
• B. CMP
• C. TSH
• D. CT head

Answer: (A)

Screening for recurrent infections starts with a complete blood count. A CBC gives a quick look at the immune system and hematologic status by showing the white blood cell count and differential, along with indicators of anemia or platelet abnormalities. Abnormalities can point toward immune deficiency, hematologic disorders, or other conditions that would require further workup. If the CBC is normal but recurrent infections persist, you’d pursue more targeted immunologic testing (such as quantitative immunoglobulins or vaccine antibody responses). Tests that focus on metabolism, thyroid function, or brain imaging aren’t indicated solely to explain recurrent otitis media.