How are RBC and WBC reported in urine analysis?

The reporting of red blood cells (RBC) and white blood cells (WBC) in urine analysis is typically done by calculating the average number of these cells per 10 high power fields (HPF) when viewed under a microscope. This method provides a standardized way of quantifying cells in urine samples, allowing for a more uniform comparison between results from different analyses.

Using a high power field for counting allows for a clear view of the sample and a reliable estimate of cell density, as each field represents a specific volume of urine. By calculating the average across multiple fields, it reduces variation and increases the accuracy of the cell count. This is particularly important in detecting abnormalities such as hematuria (presence of RBC) or pyuria (presence of WBC), which can indicate different underlying conditions.

Other methods, such as counting as a total count or as a percentage of urine volume, do not provide the same level of clarity or consistency in quantifying cells as the HPF method does.