Which of the following is a contraindication for performing spirometry?

Hemoptysis, or coughing up blood, is a significant contraindication for performing spirometry. The reason for this is that spirometry may exacerbate the underlying condition causing the hemoptysis, leading to potential complications such as increased bleeding or further respiratory distress. It is essential to ensure the patient's safety and protect their health when assessing their pulmonary function.

In contrast, conditions like stable angina, minor infections, and a common cold may require caution, but they do not present the same immediate and serious risk associated with hemoptysis. In fact, spirometry can sometimes be safely performed in patients with stable angina if they are medically stable, and testing might be postponed in cases of minor infections or a common cold to avoid potential discomfort or inaccurate results. However, the presence of hemoptysis warrants a complete evaluation and treatment of the underlying cause before any pulmonary function tests can be considered.