Mary Jones underwent a cardiac procedure and her blood pressure is being monitored. Her nurse noticed a difference between the mean arterial pressure (MAP) displayed on the monitor and the MAP she calculated using the usual (SBP + 2DBP)/3 formula. There are a few reasons why the values may differ: 1) The monitor displays the MAP directly measured by the cuff, while the formula provides an estimate. 2) True MAP can only be determined invasively, while noninvasive methods like oscillometry and auscultation may vary from invasive readings by up to 5 mmHg. 3) Research shows oscillometric MAP more closely matches invasive MAP than SBP or DBP. Clinicians can generally trust the MAP