Which of the following is subjective data for oxygenation/perfusion?

• A. Breath sounds
• B. Edema
• C. Skin color
• D. Dyspnea

Answer: (D)

Subjective data are symptoms reported by the patient, describing how they feel or what they perceive, while objective data are observable signs the clinician can measure or observe. In terms of oxygenation and perfusion, dyspnea is a patient-reported sensation of shortness of breath or breathing difficulty, which makes it a subjective data point. Breath sounds are obtained through auscultation and reflect the lungs’ state, edema is visible or measureable swelling, and skin color can be observed for pallor or bluish discoloration—the latter two are objective clinical signs. Because dyspnea comes from the patient's own description, it best represents subjective data.