The nurse is caring for a patient who complains of a headache. This is an example of which type of data?

A. Objective:
Objective data refers to measurable and observable information, often obtained through assessments, tests, or observations. It includes vital signs, laboratory results, physical examination findings, and other data that can be quantified and documented. For example, a blood pressure reading, a recorded temperature, or the observation of a patient's skin color are objective data points.

B. Unreliable:
Unreliable data refer to information that cannot be trusted or depended upon due to its inconsistency or lack of credibility. If a patient provides information that is conflicting, constantly changing, or not coherent, it might be considered unreliable. In healthcare, it's crucial for data to be reliable to ensure accurate diagnosis and treatment.

C. Subjective:
Subjective data are patient-reported information based on their own feelings, experiences, or opinions. This information cannot be measured or observed by others and is typically obtained through patient interviews. Symptoms like pain, headache, or nausea fall into the category of subjective data because they are felt and described by the patient but cannot be independently verified by the healthcare provider.

D. Historical:
Historical data pertain to a patient's past medical history, including previous illnesses, surgeries, allergies, medications, and family medical history. It provides context for the patient's current health status and aids healthcare providers in understanding the patient's overall health background.