BIOS BD215 - Obtaining Accurate Measurements; Before Measuring; Common Sources of Error

3.2 Select the User
This blood pressure monitor is designed to store 90 measurements for each of two users. Before
taking a measurement, be certain that the correct user has been selected.
1. Press the
START
STOP
M
button to toggle between User 1 and User 2.
3.3 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.
3.3A Before Measuring
• Avoideating,smokingaswellasallformsofexertiondirectlybeforethemeasurement.Allthesefactors
influence the measurement result. Relax by sitting in an armchair in a quiet atmosphere for about 5 minutes
before the measurement.
• Alwaystakemeasurementsonthesamearm(normallyleft)andinthesameposture.Donotswitchbetween
right and left arms while recording your blood pressure as there may be a difference of up to 10mmHg
pressure between the two arms.
• Attempttocarryoutthemeasurementsregularlyatthesametimeofday,sincebloodpressurechangesduring
the course of the day. The ideal time to measure your blood pressure is in the morning after you wake up,
before breakfast and physical activity, and in the absence of the urge to urinate.
• Restfor5minutessittingquietlyandreleaseallthetensioninyourbody—especiallythearmmuscles—before
beginning with the measurement. Remain calm and quiet when the measurement is in process. Do not speak
or move your arm (as well as other body) muscles during the process.
3.3B 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.
• Withrepeatedmeasurements,bloodaccumulatesinthearm,whichcanleadtofalseresults.Consecutive
blood pressure measurements should be repeated after at least a 15 second pause or after the arm has been
held up in order to allow the accumulated blood to flow away.
START
M
STOP
PUL