If you mean white blood cell differential count you can use normal slides after stain it.

Regards

Thank you Khalid,

but I will be doing estimates and need accuracy between samples

joe

Any standard flowcytometer instrument use for humans should do it. Sysmex, advia, coulter is most common. Take tke samples to your local hospital and talk eith the lab. See https://pdfs.semanticscholar.org/2ceb/bbf8230a08b64b2e4a345a628642e4eaaabe.pdf