Final answer:
Measuring the blood pressure at the beginning and end of the visit helps to identify any changes in blood pressure and determine the accuracy of the measurement.
Step-by-step explanation:
The reason for measuring the blood pressure at the beginning and end of the visit for patients who suffer from "white coat" syndrome is to identify any changes in blood pressure during the visit. This helps to get a more representative value of the patient's blood pressure once they have calmed down. By comparing the blood pressure readings before and after the visit, it can also help to determine the accuracy of the blood pressure measurement.