Which of the following is NOT a patient identification field?

The class of case is not considered a patient identification field because it pertains to the type of case being reported rather than identifying the patient. Patient identification fields are specifically designed to uniquely identify individual patients, ensuring that all records related to a specific patient can be accurately linked and retrieved.

Social security number, race, and date of birth are all key identifiers that help uniquely distinguish one patient from another. The social security number is a unique identifier assigned to individuals in the U.S. and is often used for various administrative purposes. Race can assist in understanding population demographics and health disparities, although it is less commonly used as a primary identifier. The date of birth is crucial for confirming a patient's age and identity.

In contrast, the class of case refers to the classification of the cancer case itself—such as whether it is a new diagnosis, a recurrence, or a follow-up. This classification is important for clinical data and epidemiological studies but does not serve to identify the patient personally.