Ventilation/perfusion tests are used to evaluate which body region?

• A. Lung NM Studies
• B. Nuclear Medicine Physician
• C. Gastrointestinal NM Studies
• D. Genitourinary Studies

Answer: (A)

These tests assess how air moves in the lungs and how blood flows through the lung tissue. By imaging ventilation with an inhaled radiotracer and perfusion with an IV radiotracer, clinicians look for mismatches between air flow and blood flow. Such mismatches are most informative for evaluating conditions like pulmonary embolism and other lung pathologies. Therefore, the body region being evaluated is the lungs, making lung nuclear medicine studies the best choice. The other options correspond to different organ systems or roles and do not describe the use of ventilation/perfusion imaging.