Different blood pressure reading in right and left arms, a cause for concern ? should said readings be spaced 5 minutes apart ?

Normal: The left arm is closer to the heart, the right arm is further away from the heart. The condition of the blood vessel also make a difference. Generally everybody has a different blood pressure measurement in each arm. The key is not the 2 being different, the key is the measurement is within acceptable parameters.

Maybe...: It is normal to have difference of BP up to 20 mmhg between arms.