Cоmpletа lа frаse. Cоmplete the sentence. Estоy [A]
Select the cоrrect аnswer: A 28-yeаr-оld аdult presents fоr follow-up with the primary care nurse practitioner with a long-history of abdominal/bowel complaints of pain accompanied by recurrent epidoses of foul, smelling diarrhea and flatulence. The patient has missed multiple days at work due to gastrointestinal complaints. The patient has experienced similar complaints since late adolescence and reports no episodes of international travel, The symptoms were confirmed in a 2-week symptom diary. Lab testing also confirmed the presence of a microcytic, hypochromic anemia. Which of the following diagnostic tests would be most specific in differentiating between plausible diagnoses in this patient?