Some tests require serum or plasma (instead of whole blood) for the diagnostic. If you do not have access to a centrifuge, one option is to use a battery-operated fan and connect your tubes of blood to the blades.
If you wish something more sustainable, you could build a hand-cranked centrifuge as designed by Dale Fritz and Pepper Jones at SIFAT (www.sifat.org).
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Materials List (pdf here) Directions for Construction (pdf here)