BIOS W100 Instruction Manual - 3.2B Common Sources of Error
3.2 Obtaining Accurate Measurements
Your blood pressure can vary based on numerous factors, physiological conditions, and your
surroundings. Follow these guidelines to obtain accurate and error-free measurements of your
blood pressure and pulse rate.
3.2A Tips on Taking Accurate Measurements
In morning before breakfast,
2 hours after dinner, before
taking medication
Avoid coffee and smoking
Within the hour, and no
exercise 30 minutes before
measuring.
Do not speak while taking the
measurement.
Sit with legs uncrossed so as
not to restrict blood flow.
Empty bladder (if necessary).
Rest quietly for 5 minutes.
Remain calm and quiet while the
measurement is in process.
Take measurements on the non
dominant arm.
Sit with back supported and
measurement arm resting on
a table. Sit with feet flat on
the floor.
3.2B Common Sources of Error
All efforts by the patient to support the arm can increase the blood pressure. Make sure you are
in a comfortable, relaxed position and do not activate any of the muscles in the measurement arm
during the measurement. Use a cushion for support if necessary.
ATTENTION!
Comparable blood pressure measurements always require the same
conditions with a peaceful and calm environment. Ensure that you take
measurements under the same conditions to obtain an accurate estimate of
blood pressure variation patterns.
• If the arm artery lies considerably lower or higher than the heart, an erroneous value of blood
pressure is measured. Each 15 cm difference in height results in a measurement error of 10 mmHg.
• A loose cuff causes false measurement values.