Sorry to hear about your kitty. I do hope they had a false positive the first time.
The serum should be a clearish almost peach or flesh colored stuff. (kinda hard to describe a color you know?) A perfectly crystal clear serum is usually from animals that have not eaten in several days, and redish serums sometimes come when we have a hard time drawing blood. Very cloudy globby serums is fat in the blood (usually from animals that are overweight or have just eaten before the test). Outright yellow serums can be a sign of jaundice (very pale yellowish clear is sorta normal).
I found a webpage that shows a picture of a separator tube with the serum in it. However it's on a page about drawing chicken blood so I don't know if that explains the color or not since I don't know anything about chickens. If that was blood we see at work it would be called hemolysed (sp?). Anyways it will give you an idea of what the samples look like just before testing.
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