During blood pressure measurement, the position that a patient should avoid is:

The position that a patient should avoid during blood pressure measurement is squatting. This is due to the fact that squatting can significantly affect hemodynamics and may lead to altered blood pressure readings. When a person squats, it can increase venous return and cause changes in cardiovascular dynamics that could lead to misleadingly high blood pressure measurements.

In contrast, sitting, lying, and standing positions are generally accepted for blood pressure measurement, with specific guidelines around these positions to ensure accurate readings. When measuring blood pressure, consistency in position is crucial because variations can affect the results. Therefore, squatting is typically not recommended as it does not reflect the usual positions in which patients are monitored for blood pressure.