Interpreting Sample Results

classic Classic list List threaded Threaded
2 messages Options
Reply | Threaded
Open this post in threaded view
|

Interpreting Sample Results

Ian Wilde
Administrator
Just wondered if there was a basic rule of thumb for distinguishing between samples of bad quality and samples where they have most likely been contaminated due to a handling error?

e.g. having <0.25 Endotoxins but having rampaging CFU's?
Reply | Threaded
Open this post in threaded view
|

Re: Interpreting Sample Results

Garry
For a failure or action level our rule of thumb (policy) would be to resample without taking any improvement measures.  If the resample comes back clear then we would attribute it to contamination in some part of the sampling process.  We have not looked into the frequency of endotoxin failures that clear on resample against those for CFU so unsure if one is more indicative of technologist contamination than the other.

The majority of our endotoxin measurements come in at <0.050EU/ml (current limit of tests we perform).  I've noticed (so nothing scientific) that if the endotoxin results come back a fraction higher, say 0.056EU/ml, this is often accompanied by the accompanying CFU count reaching action level or failing.