Is DNA testing always conclusive?
DNA testing can never be 100% conclusive even though popular coverage in the press gives this impression. Whilst identifying a genetic relationship between a donor conceived offspring and their donor is more straightforward in scientific terms, identifying such a relationship between genetically related half siblings is scientifically more challenging and more dependent on a variety of factors. For this reason, UK DonorLink can never guarantee that a genetic relationship identified through DNA testing is 100% conclusive. Advice and information given to registrants is based on the analysis of individual DNA by the laboratory. (Please refer to the DNA information leaflet).