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Blood and urine are spun on centrifuges.
The old woman had spun many threads on her spinning wheel before.
The gel seperates the serum from the red blood cells
Red blood cells, serum, plasma
buffy coat
Plasm
Usually 40-50% of the blood volume i.e. 8-10ml.
Knitting is accomplished usually with pairs of needles -- knitting needles, to be exact -- and some form of spun fiber spun into a long, long length -- usually several hundred metres long, and even longer.
Packed, spun-down or lysed red blood cells would be better.
spun
First the cotton gets picked afterwards it gets cleaned and also get dyed, or whitened, then spun into thin threads. Then the threads gets woven into cloth. After the cloth gets cut into pieces and stitched together as clothes.
The test to determine the proportion of red blood cells in a blood sample is a hematocrit.