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Dräger DrugTest 5000 Test System
Troubleshooting
4.2
Problems during saliva sampling
The sample adequacy indicator on the sampler changes to
blue during the oral fluid absorption thereby indicating that
sampling can be stopped. To make sure that the user can
check the sample adequacy indicator, the test subject has to
interrupt the oral fluid sampling at certain intervals (approx.
1 minute) and remove the sampler for a short time from the
mouth for appraisal.
Any kind of blue colouration of the sample adequacy indicator
shows that the saliva sampling can be stopped. This also
applies to cases where only sections of the indicator are blue
or where the blue colouration is unevenly distributed.
If the collection of the oral fluid sample was carried out
properly, the test will typically take 30 seconds to 2 minutes. A
critical prerequisite is that the sampler is inserted deep enough
into the mouth and moved about the oral cavity to make sure it
wipes over the oral tissue and underneath the tongue.
Contingent upon low salivation ("dry mouth") the oral fluid
sample collection can take longer in exceptional cases. If this
occurs, you can stop the sampling after four minutes and
perform the analysis with reduced oral fluid sample volume.
If a minimal volume of oral fluid has been collected and the oral
fluid sample contains high drug concentrations, the chance for
a positive test result is very good.
