8. Parameters ABL90 FLEX reference manual
8-4
The following ranges are used:
Range Description
Indication
The range of indication for a parameter is the range within which
the analyzer is physically capable of measuring.
Reportable Is user-defined; is equal to or narrower than the range of
indication. Can be selected for all measured and derived
parameters.
Reportable range is the range of results from a testing system or
method over which a specified analytical performance is claimed.
Reference "Reference ranges are valuable guidelines for the clinician, but
they should not be regarded as absolute indicators of health and
disease. Reference ranges should be used with caution since
values for ‘healthy’ individuals often overlap significantly with
values for persons afflicted with disease. In addition, laboratory
values may vary significantly due to methodological differences
and mode of standardization" [10].
Ref. 10 has been the source for the reference ranges given in this
section. In some cases the values are taken from other sources
marked by their reference number.
When possible, the reference ranges for arterial blood have been
listed. Reference ranges must be used with caution as they
depend on a number of factors, such as sex, age and normal
physiological condition.
Critical limits are user-defined and can be entered into the analyzer software –
see section Reference ranges and critical limits in chapter 1.
Derived parameters are calculated according to the equations stated.
If… Then…
the required measured or
input values are unknown
default values are used, unless a measured
parameter does not have a value or is
outside the range of indication.
all values are known the derived parameter is designated
calculated and a "c" is added to the result.
a default value is used the derived parameter is designated
estimated and an "e" is added to the result.
If one or more default values have been used in the calculation, the result may
deviate significantly from the true value. The deviation on "estimated" oxygen
status parameters might become particularly significant if default values are
used instead of measured blood oximetry data.
In some cases, however, the default value is not accepted as the input for the
calculation. This is because the actual values of the missing parameter may
deviate significantly from the default value, thus making the estimation clinically
inappropriate. If sO
2
cannot be measured due to severe errors, it will be
calculated.
Ranges and
limits
Derived
parameters
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