microhematocrit
noun
mi·cro·he·mat·o·crit
variants:
or chiefly British microhaematocrit \ -hi-ˈmat-ə-ˌkrit 
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Medical Definition of microhematocrit
1
: a procedure for determining the ratio of the volume of packed red blood cells to the volume of whole blood by centrifuging a minute quantity of blood in a capillary tube coated with heparin
2
: a hematocrit value obtained by microhematocrit
a microhematocrit of 37 percent