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Measurement performance





Under which conditions can I get the best possible measurement results?
Measurement conditions:
  • Measure your blood pressure under comparable living situations - under relaxed and quiet conditions at the same time frame of the day, eg. every evening about an hour after you had dinner.
  • Perform the measurement while sitting in a quiet atmosphere.
  • Avoid eating, smoking as well as all forms of exertion directly before measurement.
  • Take several minutes rest before measuring.

Measurement preparations:
  • Confirm that the circumference of your arm or wrist is covered by the range as written on the cuff.
  • Fit the cuff as explained in the manual.
  • Put on the cuff and secure it tightly but not so tight as to be uncomfortable.
  • With upper arm monitors, take care not to restrict the blood flow by pushing up the sleeve too tightly. Thin clothes on the arm do not interfere with the accuracy.
  • Connect the cuff with the main unit, switch the device on and inflate the cuff pressure according to the manual instructions.
  • With wrist monitors, take care that the wrist is at heart level! A 10 cm difference in height would result into a measurement error of 8 mmHg!

During the measurement:
  • Avoid any kind of movement.
  • Do not activate any of the muscles in the measurement arm.
  • Breath normally and do not talk.
  • If you want to perform several measurements sequentially, you should wait at least 15 seconds between two measurements.



How often and when shall I measure my blood pressure with the Microlife digital blood pressure monitor?
  • The more you measure, the better! But as blood pressure is a very much variable body parameter, be aware that the results are not always the same. To compare your pressure level between each day, you should perform a daily measurement under comparable living situations. Measure, for example, an hour after you had dinner. Make sure that you feel relaxed and are not disturbed by your environment.



What is the meaning of the different messages «Err1», «Err3», etc.?
  • Microlife's blood pressure monitors are developed to detect the blood pressure accurately and to display the result only if it is clearly free of errors. If an error is detected during measurement, the device distinguishes between different causes of the error and displays the related error number accordingly. The instruction manual explains each error code.



I have a pacemaker - can I use a Microlife monitor to measure my blood pressure?
  • Pacemakers stabilise heart frequency (pulse) of patients, so the heart pumps blood with corresponding systolic and diastolic blood pressure. If the pulse is provided or supported by pacemakers, blood pressure monitors are able to measure blood pressure reliably (within the accuracy limits indicated).
  • Blood pressure monitors can therefore be used by patients with pacemakers. The accuracy of the pacemaker should however be controlled by a doctor and not by the pulse indication on the blood pressure monitor. (Refer to the corresponding information in the instructions). If the user has any queries or concerns in regards to blood pressure, especially in relation to pacemakers, he/she should always consult a doctor.



On which side should I generally measure my blood pressure, left or right?
  • Here, we have to distinguish between upper arm and wrist devices.
  • With upper arm devices, it is recommended to find out first at which arm you obtain higher blood pressure readings. Then you should monitor your blood pressure at the arm, which gave higher values.
  • Wrist devices are designed for the measurement performance on the left wrist, only.



My arm circumference is outside the stated limits. What shall I do?
  • If you use a Microlife upper arm monitor, the standard cuff is suitable for upper arm circumferences between 22-32 cm. If your circumference is larger than 32cm, you need the Microlife L-cuff (for circumferences between 32-42 cm). If your circumference is lower than 22cm, you need the Microlife S-cuff (for circumferences between 17-22 cm).
  • The wrist cuff is suitable for wrist circumferences between 13.5-21 cm.



I have a very thin upper arm and the circumference is less than stated on the standard cuff. Can I use a wrist monitor if the cuff fits well at my upper arm?
  • No! Wrist monitors apply a completely different detection procedure that is specifically designed for the physiological condition at the human wrist. This cannot be transferred to the upper arm even, if the cuff would fit.



Do I have to place the cuff at upper arm exclusively or can I put it at other places such as forearm or leg?
  • The cuff of upper arm devices can only be placed at the left or right upper arm. Please make sure that the circumference as written on the cuff suits the circumference of your arm.
  • Wrist devices are designed for the left wrist, only.
  • Even if the cuff fits at other sites, please accept that the devices are exclusively designed for the upper arm or the left wrist and would give wrong results in other positions.



What happens if I do not place the wrist cuff at heart level?
  • It is very important that the cuff is positioned at heart level during measurement. A position 10 cm higher than heart level means an underestimation of about 8 mmHg while 10 cm below heart level means about 8 mmHg overestimation of the blood pressure.



How long should I wait between measurements?
  • If you want to perform several measurements sequentially, you should wait at least 15 seconds between two measurements.



I installed new batteries, but after 50 measurements they were already empty. Is this normal?
  • Microlife blood pressure monitors are equipped with high quality long life batteries. The confirmed lifetime of these batteries is about 800 operation cycles for upper arm and 400 cycles for wrist monitors.
  • When new batteries are installed, but readings thought to be disappointing, please check the following:
    • What type of battery was installed - a standard battery or a long life battery? Even with a new standard battery the lifetime is several hundred operation cycles!
    • How old is the battery - During long storage times, batteries loose capacity.
    • Is it really a new battery or was it used already?
  • A battery may work with other devices (eg. alarm clock) that have a lower minimum required input voltage but may not work with a blood pressure monitor that has a relatively higher minimum level.
  • A disappointing lifetime may also happen with rechargeable batteries, because even fully charged rechargeable batteries have a lower capacity than non-rechargeable ones!
  • Extensive warehouse or storage time can significantly reduce the life-time of a battery.
  • Room temperature (eg. below 15°C) also affects battery life - reduces the life-time significantly!