Measurement Procedure; Before Measurement; Common Sources Of Error - Microlife BP3MC1-PC Instruction Booklet

• There is a break of 15 seconds between the measurements (15 seconds are adequate according
to "Blood Pressure Monitoring, 2001, 6:145-147" for oscillometric instruments). A count down
indicates the remaining time and a beep will sound 5 seconds before the 2nd and 3rd readings
will begin.
• The individual results from measurements 1, 2 and 3 are not initially displayed.
• If you want to see each of the individual readings making up a triplicate reading,
press and hold the "M" button for 3 seconds immediately after a Microlife Averaging
Mode measurement. Please note: You can only see the individual readings one time
immediately following an Averaging Mode measurement. See section 5.4 G.
• Do not remove the cuff between measurements.

5. Measurement Procedure

Please note: You should always be seated before and during measurement.

5.1. Before measurement:

• Avoid eating and smoking as well as all forms of exertion directly before measurement. These
factors influence the measurement result. Find time to relax by sitting in an armchair in a quiet
atmosphere for about ten minutes before taking a measurement.
• Remove any garment that fits closely to your upper arm.
• Always measure on the same arm (normally left).
• Always compare measurements taken at the same time of day, since blood pressure changes
during the course of the day, as much as 20-40 mmHg.

5.2. Common sources of error:

Note: Comparable blood pressure measurements always require the same conditions!
Conditions should always be quiet.
• All efforts by the user to support the arm can increase blood pressure. Make sure you are in a com-
fortable, relaxed position and do not flex any of the muscles in the measurement arm during the
measurement. Use a cushion for support if necessary.
• If the arm artery lies considerably lower or higher than the heart, an erroneously high or low blood
pressure will be measured! Each 15cm (6 inch) difference in height between your heart and the cuff
results in a measurement error of 10 mmHg!
• Cuffs that are too narrow or too short result in false measurement values. Selecting the correct cuff
is extremely important. Cuff size is dependent upon the circumference of the arm (measured in the
center). The permissible range is printed on the cuff. If this is not suitable for your use, please call 1-
800-568-4147.
Note: Only use clinically approved Microlife cuffs!
• A loose cuff or a sideways protruding air pocket 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 a 1 minute pause or after your
arm has been held up in order to allow the accumulated blood to flow away.
If you decide to take your Averaging Mode measurement again, be sure to wait at least one
minute beforehand.
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