Board Thread:Naruto Discussions/@comment-26320097-20150423120614/@comment-26256734-20150619222041

also want to point out as Kusanagi Hiei said its Suigetsu that did the test and he isn't really the smartest guy in Orochimaru's ranks who knows if he did the test right plus he said or rather thought to himself that he didn't know where the DNA sample in Karen's desk came from EDIT: did a little research into umbilical cord DNA (sense i know anything about it) and from what i have been able to find the DNA in the umbilical cord is from the baby not the mother (in fact DNA from the cord is used in paterinty tests after the baby is born) so this is more proof that Karen for whatever reason has Sarada's umbilical cord (still thinking for Orochimarus expariments) and that Suigetsu tested Sarada's DNA against her own DNA that would explain the 100% match