Which of the following must be documented in the progress note of this patient's electronic health record?

While the date of the last office visit is important for understanding the patient's history and care plan, it is not a mandatory requirement to document in every progress note. The focus of a progress note is primarily on the current interaction rather than a historical summary.

The patient's date of birth is essential for identification and demographic purposes but does not need to be documented in every progress note. It is generally recorded in the patient's profile and does not change frequently, making it unnecessary for each interaction.

Although knowing the primary care physician's name can be useful for care coordination, it is not a required entry in every progress note. This information is usually recorded in the patient's record and can be referenced as needed.

Recent laboratory results are important for clinical decision-making but do not need to be included in every progress note. They are typically documented in a separate section of the electronic health record and referenced during the discussion if relevant to the current visit.