Project Type
Instructions
Date: March 27 2020
Customer: Thermor Ltd
Job Number: TH1011
Item Number: 3AL1-3E
Designer: Alex Vranjesevic
Revision: B
Artwork is not to be amended or scaled. If any changes
are required please send through Thermor office with
instructions, and we will amend here and resend artwork
through. PLEASE RETURN WITH SIGNATURE
Contact: Graphic’s Department
Colour Breakdown
Reason For Project:
New Item:
New Branding: X
Design Update:
N/A:
UPC (For Reference Only)
1.2C Comparing Readings to Other Blood Pressure Devices
Many questions arise when two blood pressure devices are compared in an effort to check accuracy. An accurate
comparison requires repeatable measurements under the same conditions to “reference device” with known accuracy.
Significant time is required to reduce naturally occurring blood pressure variability during the test. The subject should
be seated comfortably with feet flat on the floor, and have rested for 5 minutes before the first reading to allow blood
pressure levels to stabilize.
The patients back, elbow and forearm should be supported, and the middle of the cuff should be at the level of the
right atrium. There should be no talking or moving during the measurement and if comparing to an aneroid gauge or
mercury column, observers should avoid parallax and be careful not to round measurements.
The most accurate way to compare devices is to take two readings at the same time. However, most people and
doctor’s offices do not have the equipment necessary to measure blood pressure from two devices simultaneously.
To take sequential measurements properly requires a pair of initial measurements to determine the subjects blood
pressure level: first with the reference equipment, followed by 60 seconds, then with the monitor-under-test.
The actual accuracy test requires three pairs of measurements with 60 seconds between measurements. These
measurements are averaged and a comparison can be made. Since most people tend to relax and their blood
pressure falls with subsequent measurements, following this protocol reduces these natural changes in Blood
Pressure levels. The standard technical error of both consumer and professional devices is normally ±3 mmHg, so a
discrepancy of 6 mmHg is acceptable even when the devices are working within their specifications.
Any comparisons without a known “reference device” and not following the procedures described above will yield
unreliable results. In addition, to do an accuracy test properly the reference device must also be tested to a known
reference to confirm its accuracy, prior to being used as the reference for comparisons.
1.2D Calibration
Digital blood pressure monitors do not require regular recalibration. Unless the product has been dropped and internal
parts have been damaged. If the unit turns on and does not display an error code, the product is working properly. In
extremely rare cases, the cuff may have developed a pin-hole leak, or the gasket where the cuff connector enters
the monitor may not have a proper seal; both of these leaking air issues will potentially cause errors in accuracy, but
otherwise the product will work accurately without drifting out of calibration.
1.3 What do your Numbers Mean?
Blood pressure is the pressure in your blood vessels while blood circulates throughout your body. High blood pressure
or “Hypertension” is the pressure at which ones normal average blood pressure is considered too high and other
health risks including: heart attack, stroke, dementia, kidney failure, heart disease and erectile dysfunction may occur.
It is expressed as two numbers: systolic/diastolic 120 mmHg/ 80 mmHg (mmHg= millimeters of mercury). “Systolic”
numbers refer to the pressure on the walls of your arteries while the heart is contracting and pushing blood.
“Diastolic” pressure is the lower number when the heart is at rest and relaxed. A simple way to understand this is to
picture a garden hose. When the tap is turned on, the immediate pressure on the walls of the hose is the “systolic”
number, and when the tap is turned off it is the “diastolic” number.
There are many different causes of high blood pressure. We differentiate between common primary (essential)
hypertension, and secondary hypertension. The latter group can be ascribed to specific organic malfunctions.
Please consult your doctor for information about the possible origins of your own increased blood pressure values.
1.4 Normal Blood Pressure Values
Blood pressure is too high when measuring at home and you have rested, the diastolic pressure is above 85 mmHg or
the systolic blood pressure is over 135 mmHg. If you obtain readings in this range, consult your doctor immediately.
