The Hct is expressed as a percentage of what?Click for Answer
We have discussed two approaches to determining the hematocrit (Hct): the manual (spun) Hct and the Hct calculated from the red cell count and mean cell volume (the latter two parameters being directly measured using automated hematology analyzers). Which tends to be higher?
Spun hematocrit is 1% to 3% higher than the hematocrit from automated instrument due to plasma that is trapped in the erythrocyte layer.
In theory, can the hematocrit be normal with a hemoglobin (Hb) of zero?
The Hct is a function of cell size and number. It is impervious to what is inside the cell, including the amount of Hb (see next slide).
Under what conditions is the spun Hct carried out instead of automated method?Click for Answer
The following is a complete blood count from a patient with cold agglutinin disease:
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