What is the normal blood pressure variation between arms in mm Hg?

The normal variation in blood pressure readings between arms is typically accepted to be up to 10 mm Hg. This is considered clinically insignificant and can occur due to anatomical differences or vascular resistance in each arm. A variation greater than this threshold may indicate underlying vascular problems, such as subclavian stenosis or other forms of arterial obstructions.

While readings can occasionally be higher, such as 15 mm Hg, which may occur in certain individuals without significant health issues, 10 mm Hg is the standard reference point used in clinical practice for what is acceptable as normal variation. Recognizing these differences is crucial for health professionals when assessing cardiovascular health and making treatment decisions.

Understanding this variation can help guide further evaluation if the difference is consistently over the expected range, prompting detailed assessment of the patient's vascular health.