Quality Control CheckIn order to ensure that your measurements are reliable, we strongly recommend reviewing the raw data impedance values. If an arm or leg moves, an electrode peels off, for example, during the few seconds of measuring time, it may invalidate that measurement. We also recommend that at least two sets of data should be collected at each time. Two methods:
This means looking at the impedance values at each successive frequency. Each value MUST be lower than the previous impedance value.
If the four values are plotted on a graph, the curve should be smooth with minimal or no ‘bumps’. The data points and curve should lie on or very close to each other. The table and graph illustrate this. Graphic display of the raw data depicted above:
Here are some examples of typical valid measurement values: Healthy Female, (during menstrual cycle), Illness Marker 0.816, Phase Angle 5.1°
Healthy Male, Illness Marker 0.769, Phase Angle 6.6°
Critically Ill Male in ICU, Oedematous (survived), Illness Marker 0.874, Phase Angle 3.3°
Critically Ill Male in ICU, Significant fluid overload (died), Illness Marker 0.957, Phase Angle 0.7°***
***There is thought that PA cannot be measured accurately in a state of significant fluid overload. The Illness Marker value, however, is accurate This is an actual example of inaccurate measurement: Illness Marker 0.077 (impossible to have such a value)
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