Computerized tomography, endoscopic ultrasound (EUS), capsule endoscopy, balloon enteroscopy, ascitic fluid adenosine deaminase (ADA), tuberculosis polymerase chain reaction (TB-PCR), GeneXpert MTB/RIF assay (Cepheid, Sunnyvale, CA), and laparoscopy can be beneficial in the diagnosis of intestinal tuberculosis. The gene discussed is ADA; the disease is intestinal tuberculosis.