Final answer:
To identify a patient's EHR accurately, at least two identifiers are typically required, which include the patient's name, date of birth, or medical record number. The exact number may vary by institution.
Step-by-step explanation:
To correctly identify a patient's Electronic Health Record (EHR), it is essential to use multiple identifiers to ensure accuracy and protect patient privacy. The specific number of identifiers can vary depending on the healthcare facility's policies and regulations, but typically, at least two identifiers are used. Common identifiers include the patient's name, date of birth, medical record number, and sometimes an address or a phone number. Using multiple identifiers helps to reduce the risk of errors such as duplicate records or misidentification, which can lead to serious healthcare mistakes.