The Chinese University of Hong Kong, Prince of Wales Hospital 1 article published in JoVE Biology Multiplexed Fluorescent Immunohistochemical Staining of Four Endometrial Immune Cell Types in Recurrent Miscarriage Yiwei Zhao1, Gene Chi Wai Man1,2, Loucia Kit Ying Chan1, Xi Guo1, Yingyu Liu3, Tao Zhang1, Joseph Kwong1,4, Chi Chiu Wang1,5, Xiaoyan Chen3, Tin Chiu Li1 1Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Prince of Wales Hospital, 2Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Prince of Wales Hospital, 3Department of Obstetrics and Gynaecology, Shenzhen Baoan Women’s and Children’s Hospital, Shenzhen University, 4School of Medicine, Faculty of Medicine and Health Sciences, Keele University, 5Li Ka Shing Institute of Health Sciences; School of Biomedical Sciences, The Chinese University of Hong Kong Despite the advancements in multiplex immunohistochemistry and multispectral imaging, characterizing the density and clustering of major immune cells simultaneously in the endometrium remains a challenge. This paper describes a detailed multiplex staining protocol and imaging for the simultaneous localization of four immune cell types in the endometrium.