Quite a few people have different blood pressure values between their right and left arms. Experts therefore advise a comparative measurement on both arms. If a measurement difference of more than 10 mmHg is detected, the measurement should always be taken on the arm with the higher values. Small blood pressure differences of up to 10 mmHg between the two upper arms have no pathological significance and occur more frequently even in healthy people. The differences are usually due to a difference in muscle density or tension in the muscles of the upper arms.
See a doctor if there are major differences in measurements
On the other hand, larger differences in measurements between the arms may indicate anatomical or pathological peculiarities. It is then reasonable to suspect that feeding arteries on the side with the lower values are narrowed. Patients should consult their physician in this case and have the exact causes clarified.
The correct measurement technique
Hardly any physiological variable fluctuates more during the course of a day than blood pressure. To be able to compare the measured values with each other, the measurements should therefore always be taken at the same time and under comparable conditions. It is best to measure on an unclothed arm; at most, a light shirt can be kept on. When rolling up the sleeves, however, there should be no jamming bulge.
The most important rule, however, is to take a break and relax for a few minutes before measuring, because any exertion or excitement will drive blood pressure up for a short time.
