Answer: hematocrits

AnswerCrossword Clue
hematocritsThe ratio of the volume of red blood cells to the total volume of blood
hematocritsHEMATOCRIT, a graduated capillary tube in which the blood is centrifuged, to determine the ratio, by volume, of blood cells to plasma also HAEMATOCRIT
hematocritsAn instrument for measuring this, typically by centrifugation