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Hy there,
A doctor here
The device is placed in your branchial area, to feel for the branchial artery.
The pulsations of the branchial artery is felt through stethoscope. We can hear both systolic pressure and diastolic pressure over the stethoscope after placing the sphygmomanometer over your branchial area.

Besides branchial area, pulsations can also be felt from your radial area and carotid area.

Ideally it is better to take the bp on both arms and in three positions, i.e, lying, sitting and standing position. 

Blood pressure (BP) can be taken from either the left or right arm, it does not not make a significant difference. However if your doctor is suspecting specific health problems, then they will take blood pressure measurments from both arms and compare the readings. 

Hopefully that makes things clearer for you.

Actually either arm can be used and sometimes the right arm is used depending on which can most easily be supported and relaxed as it is important that the person being checked is as relaxed as possible - by the way ideally they should not be talking or even laughing as this raises the blood pressure!

I don't think it really matters scientifically. It could be because most people are right handed, and prefer not to suffer from pain and pressure on their writing dominant arm. 

I've certainly had my BP checked on either side, doctors and nurses have told me it doesn't matter.

But I'm no expert!

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