Histograms and Scatterplots
What type of technology does a histogram utilize? - answer Impedance technology
What is a histogram a representation of? - answer Cell number versus one
measured property, usually cell size
What cells are histograms used for? - answer WBCs, RBCs, and platelets
What is the reference range for WBCs? - answer 30-450 fL
What range is the FIRST peak on a WBC histogram and which cell does it represent? -
answer 35-90 fl
Lymphocytes
What range is the SECOND peak on a WBC histogram and what does it represent? -
answer 90-160 fL
Mononuclear cells (monocytes, reactive lymphocytes, and immature WBCs)
What range is the THIRD peak on a WBC histogram and what does it represent? -
answer 160-450 fL
Granulocytes
What does the population before 35 fL on an abnormal WBC histogram indicate? -
answer Nucleated RBCs (nRBCs), giant or clumped platelets
What does peak overlap at 90 fL on an abnormal WBC histogram indicate? - answer
Reactive lymphyocytes or blast cells
What does peak overlap at 160 fL on an abnormal WBC histogram indicate? - answer
An increase in bands, immature neutrophils, eosinophils, or basophils
What might the population after 450 fL on an abnormal WBC histogram indicate? -
answer A high granulocyte count
What is the reference size range for RBCs on a histogram? - answer 36 fL and
above
What kind of peak will a normal RBC histogram show and what does it correlate with? -
answer A single peak between 70 and 110 fL that will correlate with the MCV
