A 26-year-old woman with no prior history of pulmonary disea…
A 26-year-old woman with no prior history of pulmonary disease presents with tachypnea and reports a sensation of “not getting enough air.” She denies fever, cough, or sputum production. On physical examination, breath sounds are clear bilaterally, without wheezing, rhonchi or crackles and there are no signs of increased respiratory effort or pulmonary infection. What initial diagnostic test should the APRN consider to further evaluate this presentation?