Which method(s) can be used to tally during a WBC differential?

Which method(s) can be used to tally during a WBC differential?

• A. Commercial cell counter or by hand tally.
• B. Automated counter only.
• C. Visual estimation only.
• D. Count 200 cells.

Answer: (A)

In a WBC differential, tallying can be done with two practical approaches: an automated cell counter or counting by hand under the microscope. An automated counter analyzes the smear and provides the differential quickly and consistently. When tallying by hand, a technician counts a fixed number of white cells on the slide (commonly 100 or 200) and records the proportion of each type to calculate the percentages. Visual estimation alone isn’t used for a clinical differential because it’s subjective and less accurate. Counting 200 cells is part of the manual-tally process, but by itself it’s not a standalone method—the full approach requires classifying each counted cell. Thus, the ways to tally are either a commercial/automated counter or a manual hand tally.

In a WBC differential, tallying can be done with two practical approaches: an automated cell counter or counting by hand under the microscope. An automated counter analyzes the smear and provides the differential quickly and consistently. When tallying by hand, a technician counts a fixed number of white cells on the slide (commonly 100 or 200) and records the proportion of each type to calculate the percentages. Visual estimation alone isn’t used for a clinical differential because it’s subjective and less accurate. Counting 200 cells is part of the manual-tally process, but by itself it’s not a standalone method—the full approach requires classifying each counted cell. Thus, the ways to tally are either a commercial/automated counter or a manual hand tally.