False Positive and Negative results on the EnSURE Touch instrument.

ON occasions an unexpectedly high (positive) or low (negative) result may be obtained.

There are a number of reasons that False results can occur and the guide below will help identify some of the main reasons.

Possible Instrument calibration problem – Run Cal Check / PCD4000 calibration.
Light Leakage- Check Instrument lid is closing and sits correctly- run test in a dark room to check if there is any improvement. Lid should be flush with top instrument casing and magnet should be puling lid shut. Check for any contamination.
Contaminated Remove and clean swab chamber and check again.

If you get a negative when you are expecting a positive the light detection is not working.

There are some known procedures to address this.

Instrument detector shutter is not operating – Run a test and listen for 2 clicks to indicate the shutter is working
Test reagents are not working. Rub the swab bud between your fingers and then activate and read – a high result would be expected. For a more accurate test use the Hygiena positive control test. https://www.hygiena.com/positive-control-kit-food-and-beverage.html
Quenching of the test reagents – swab the surface and then rub the swab bud between your fingers and then activate and read- or use a positive control test (see the link to the article).

The swab is overloaded surface contaminant see article link https://help.hygiena.com/kb-doc/obtaining-low-rlu-results-when-surfaces-or-water-samples-are-visibly-contaminated/
Tests have not been stored correctly ie not refrigerated – Use positive control test or see 3 above
Tests have expired.
Using competitor swabs not designed for the EnSURE Touch instrument.

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