Both saliva and blood contain our cells, which in turn, contains our DNA. Both sample types are seen to be excellent options for DNA/genetic testing - we have gone with saliva to make testing more accessible and easier to provide. Of course, as with any test, there is a small chance of sample failure, in which recollections are offered free of charge.For most of the conditions screened for on the Eugene carrier screen, there is a >99% detection rate. Ethnicity and how common these conditions are may influence the detection rate. More information about this can be found here.Eugene works with internationally accredited diagnostic laboratories. That means that you and your doctor can use these results to make important and informed medical choices.While our test has approximately a 99% accuracy rate, no genetic test is ever going to be 100% precise — that’s just how the science works!This means that, if someone is identified as not being a carrier of a condition, there is still a very small chance that they may still be a carrier. This is called the residual risk.