Board Thread:Naruto Gaiden/@comment-1018594-20150610113403/@comment-24593592-20150611223222

Ravenlot 27 wrote: So, when I pondered all this Saku-Sara-Karin mystery, now I really doubt, if Suigetsu's genetical test was correct. Karin said her desk was "the part of her", that's why we can assume there could be a bit of Sasuke's DNA (because of Karin's habit to collect things linked to Sasuke - from portraits to his dirty clothes). Although test results aren't wrong, they could show us Sasuke's and Sarada's genetical affinity, that needs no proof, but a small misunderstanding happened.

Suigetsu used an umbilical cord.