Dear patient,

No, I don't think you're stupid.  But I do think that, yeah, you don't know what's going on here.  I mean, I can see why what you seem to think might make a kind of internal sense.  Yep, I'm pricking your finger and getting access to your blood.  And yes, the test strip sucks up that blood so the glucometer can analyze it.  And sure, the a glucometer is computer, of a sort.  But it's only just the one drop of blood.  I'm not taking it all.  Though I really can see how it might look like that for just the one moment when there's a continuity of blood from your finger to the test strip to the glucometer. 

But here's what's going on here.  I am just trying to test your blood sugar.  The glucometer's not stealing all your blood to send it to the CIA.  Or the pope.

So yeah.  I don't think you're stupid but I do think you're wrong about what's going on here.  And hey - you got one thing right.  I am a crazy white bitch.