You know what? Inigo will take that high five, thank you very much! He raises his hand to happily move it against the one Senku is holding up, a grin on his face. There's no higher praise about a good idea then when it's coming from a super genius.

"Hey, you're welcome! I guess it might be kind of hard though if the blood of people from different worlds really ends up looking different in each case." Since then it'd be pretty hard to make enough comparisons to notice much about illnesses.