Which of the following is not a subjective finding?

Subjective findings are those that are reported by the patient and cannot be measured directly by the clinician. These findings rely on the patient's personal feelings, experiences, and perceptions of their health. In this context, options like headache, shortness of breath, and ankle pain are all experiences that the patient describes based on their sensations and symptoms.

Respiratory rate, on the other hand, is an objective finding. It is measured by the clinician using a count of breaths per minute, making it quantifiable and not reliant on patient perception. Therefore, respiratory rate stands out as the only option that is not subjective, as it involves concrete data gathered through observation or measurement rather than a personal account from the patient. Understanding these distinctions is crucial for accurately assessing patient conditions and planning appropriate care.