Which of the following is a key feature of manual RBC count?

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The key feature of a manual red blood cell (RBC) count being the use of a diluted blood sample is particularly important for achieving accuracy in counting the cells. In manual techniques, the blood sample is diluted to reduce the viscosity of the sample and facilitate counting under a microscope. By performing a dilution, lab personnel can count the cells in a defined volume (often using a hemocytometer), which helps ensure that the individual cells can be identified and counted without overlap.

This dilution process is essential for obtaining reliable results, especially in cases where the sample may have a high concentration of cells. It aids in preventing crowding of cells in the counting chamber, making it easier to achieve an accurate count.

In contrast, the other options do not accurately describe the features of manual RBC counting. For instance, manual methods generally require more time compared to automated methods, which can process samples quickly and with greater efficiency. Additionally, while manual counts can be accurate, they can also vary based on the technician's skill and experience, leading to potential inaccuracies when compared to automated systems that consistently follow standardized protocols. Finally, all manual methods require the use of dilution for effective counting, making the statement regarding no dilution incorrect.

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