>OK, change of question. Called the vet and had her fax me the results. = >It says they are serum and that the levels were 0.287 ppm and 0.304 ppm. =
>Now I'm confused too. If this is the same scale on which Susan suggested = >the 200-250 range then it does seem high to me also. I'm going back = >through the archives but haven't come across anything yet that turns on =
>my lightbulb.
>Katrina
Selenium is reported in either "ppm" (0.287ppm) or "ppb" (287ppb). Some labs might also use mg/L or mcg/L, which would have the same difference in decimal points. But no matter what "units" they use, you reference will always be that particular lab's "lab normal", which can vary from lab to lab.