Question

Manual determination of WBC counts can be made using a(n):

1) Rouleaux formulation.
2) Refractometer
3) PCV card and grid
4) Improved Neubauer hemcytometer

Answer 1

A manual determination of WBC counts can be made using an Improved Neubauer hemocytometer, a calibrated slide with a grid pattern that allows for accurate counting of white blood cells. By counting a sufficient number of cells, the percentage of each type of white blood cell can be determined. Correct option is 4.

Step-by-step explanation:

A manual determination of WBC counts can be made using an Improved Neubauer hemocytometer. This is a calibrated slide with a grid pattern that allows for accurate counting of white blood cells. The sample of blood is diluted and placed in a chamber, and the cells are counted under a microscope by observing them within the squares of the grid. By counting a sufficient number of cells, the percentage of each type of white blood cell can be determined.