Which device is described as being used to calculate PCV of a blood sample?

Which device is described as being used to calculate PCV of a blood sample?

• A. PCV card reader
• B. Hemocytometer
• C. Standard WBC counting device
• D. Hematocrit tubes

Answer: (A)

PCV is the proportion of red blood cells in a blood sample, typically found by centrifuging blood in a capillary tube to separate cells and then reading the height of the packed cell column relative to the total column. A PCV card reader is designed to interpret that packed cell layer and provide a numerical PCV value quickly and consistently, reducing subjective guessing and measurement errors. This makes it the most direct device for calculating PCV in practice. The other items don’t read PCV directly: a hemocytometer (or standard WBC counting device) is used for counting cells, not for determining the packed-cell volume; hematocrit tubes are the vessels used to hold and spin the sample but do not perform the calculation themselves.

PCV is the proportion of red blood cells in a blood sample, typically found by centrifuging blood in a capillary tube to separate cells and then reading the height of the packed cell column relative to the total column. A PCV card reader is designed to interpret that packed cell layer and provide a numerical PCV value quickly and consistently, reducing subjective guessing and measurement errors. This makes it the most direct device for calculating PCV in practice.

The other items don’t read PCV directly: a hemocytometer (or standard WBC counting device) is used for counting cells, not for determining the packed-cell volume; hematocrit tubes are the vessels used to hold and spin the sample but do not perform the calculation themselves.