White blood cells (WBC) are immune system-protecting cells that can be utilized for monitoring a person's health. Images from WBC microscopy help hematologists diagnose abnormalities in the blood. It is challenging to examine microscopic images and categorize different cell types because of dissimilarities in the stage of maturation as well as intra-class differences within cell form in images brought on by using various acquisition and staining procedures. The purpose of the article is to present a comparison table of several papers that went through extensive research to derive conclusions based on the automated methodology applied with the final findings to obtain a replacement method for manual or existing methods. This document can be used as a resource in the future to learn about all the technologies and techniques currently available to provide the best results and accuracy. Researchers can obtain insights into WBC classifications using this review of the literature.