Which of the following can be evaluated only through the microscopic examination of a stained blood film?
a. White blood cell (WBC) count
b. Reticulocyte count
c. Hemoglobin concentration
d. Presence or absence of blood cell inclusions
ANS: D
Making and staining a blood film and then placing it under a microscope allow the clinical laboratory scientist to evaluate the morphology of blood cells and examine them for the presence or absence of blood cell inclusions. These inclusions are important for cell identification and, when abnormal inclusions are present, sometimes provide "clues" as to the cause of disease. All the other parameters mentioned are or can be performed using an automated hematology instrument, including reticulocyte counting.
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