Why Do Home Blood Pressure Readings Fluctuate?
Many people notice fluctuating blood pressure values at home. Consequently, they worry that their blood pressure monitor is inaccurate. In fact, incorrect measurement methods cause these unstable values. Even long-term users frequently make simple mistakes. Therefore, you must follow specific details to ensure accurate results.
Detail 1: Choose an Electronic Upper Arm Blood Pressure Monitor
Some individuals believe mercury monitors offer the highest accuracy. However, mercury monitors actually produce large errors. Non-professionals often deflate the cuff too quickly. This rapid deflation causes significant measurement errors. Furthermore, mercury poses a serious toxic danger if the glass breaks.
In contrast, a digital upper arm monitor determines blood pressure via the brachial artery. This artery sits closer to the heart. Therefore, an electronic upper arm device provides much more stable data. As a professional blood pressure monitor manufacturer, we highly recommend internationally certified electronic arm monitors.
Detail 2: Standardize Cuff Position and Tightness
Cuff size and position directly affect your final reading. Specifically, you must fit the cuff according to your arm thickness.
Position: Tie the lower edge about two to three centimeters above the elbow.
Tightness: Leave enough space to insert two vertical fingers easily.
Additionally, thick clothes can cushion the inflation pressure. This cushioning often leads to falsely high results. Therefore, wear thin clothing under 1 millimeter thick during testing. Do not roll up tight sleeves because they act like a tourniquet.
Detail 3: Maintain Proper Body Posture
You must remain completely relaxed and quiet during the process. For instance, do not talk, watch television, or drink water. Keep the device cuff level with your heart.
If you sit, place your legs naturally on the ground. Do not cross your legs. Crossing your legs contracts muscles and raises blood pressure artificially. Alternatively, if you lie down, place a small cushion under your arm.
Detail 4: Check Both Arms Dynamically
You can measure either the left or right arm. However, we suggest checking both arms periodically. Under normal conditions, the difference stays within 10 mmHg. If the values differ, always record the higher number. Never choose the lower value just for self-comfort.
Furthermore, consult a doctor if the difference exceeds 20 mmHg. In conclusion, using a professional electronic sphygmomanometer correctly ensures accurate home health tracking.
Notice:
If there is a difference of 20 mm Hg between the arms, we recommend you to ask the doctor.
Source from: Expert Support/Lu Zhigang, Chief Physician Department of Cardiology, Sixth People’s Hospital Affiliated to Shanghai Jiaotong University
