"Patient Characteristic, Birthdate"
The "Patient Characteristic Birthdate" should document the patient’s date of birth.
Timing: The "Patient Characteristic, Birthdate" is a single point in time representing the date and time of birth. It does not have a start and stop time.
Note: "Patient Characteristic Birthdate" is fixed to LOINC code 21112-8 (Birth date) and therefore cannot be further qualified with a value set.