Final answer:
Subjective information in a medical case history is best described by the patient's family history, as this information is reported by the patient and is not directly observable or measurable by tests.
Step-by-step explanation:
Subjective Information in Medical Case Histories
Subjective information in a medical case history refers to the information that is reported by the patient, including personal sensations, feelings, and perceptions. In the context of the options provided, the best description of subjective information would be D. Patient's family history. This is because the patient's family history is typically reported by the patient or their family members, and can include information that is not directly measurable or observable by medical tests or physical examination. In contrast, a kidney biopsy report (A), findings on physical examination (B), and abnormal results on a CT scan report (C) would be considered objective information as they are based on observable and measurable data.
For instance, symptoms such as nausea, loss of appetite, and pain are subjective because they are felt by the patient and cannot be directly measured, in contrast to signs or laboratory findings which can be objectively verified. Therefore, when assessing a patient's condition, both subjective and objective information are taken into account to make a comprehensive diagnosis.