Ideally the blood pressure should be taken either in lying position or sitting position
Ask the patient to relax for 5 to 10 minutes before taking the reading.
Introduce your self to the patient
Explain him what you are going to do.
Tale consent from the patient
Apply the cuff properly over the arm
Place the diaphragm of the stethoscope accurately above the brachial artery. It should lie medialy to the bicep tendon 3 cm above the cubital fossa
Inflate it upto 180 mm Hg approximately or so
Deflate it slowly at a rate of 2 - 4 mmHg per second
The point at which you hear the sound is the systolic pressure. keep deflating until the sound disappears again. this point represents the diastolic pressure.
Deflate it completely and remove the cuff
Say thanks to your patient for the cooperation.