What does Superman's Blood look like under a micscope?

In one of the Episodes of Smallville in Season 2, Clark is weakened by Meteor Rocks in the Air and a Dr. is able to penetrate through his skin and obtain a vial of blood. I've been wondering what it looks like.What does Superman's Blood look like under a micscope?If the differences were really significant he probably wouldn't be able to survive here -- thus red blood from the oxygen-bearing cells etc. I suspect that there are differences but they wouldn't be apparent without careful study.What does Superman's Blood look like under a micscope?The character is fictional.