Yn ystod y ddwy flynedd cyn cyflwyno'r system newydd o gydsyniad tybiedig, fe wnaeth Llywodraeth Cymru ymdrech sylweddol i hysbysu'r cyhoedd am union natur y newidiadau arfaethedig ynghylch trawsblannu. Yn ystod y cyfnod hwn, bu cynnydd yn nifer y trawsblaniadau organau bob blwyddyn, o 120 rhwng 1 Rhagfyr 2013 a 31 Hydref 2014, i 160 rhwng 1 Rhagfyr 2015 a 2016.
In the two years prior to the introduction of the new system of deemed consent, the Welsh Government made significant efforts to inform the public of the exact nature of the upcoming changes in respect of transplantation activities. During this period the number of organs transplanted increased each year, from 120 between the 1 December 2013 and 31 October 2014, to 160 between 1 December 2015 and 2016.