SDC1 and Infertility: In addition, other types of cut-offs have been associated with infertility, RM, and RIF, such as ≥1 plasma cell/section [11,21,26,40,41,42], ≥5 plasma cells/20 HPFs, 1–5/HPF or discrete clusters, ≥1/HPF2, ESPDI (endometrial stromal plasmacyte density index, as the sum of the stromal CD138+ cell counts divided by the number of the high-power fields evaluated) ≥0.2537, and plasma cell density (plasma cell count per unit area, calculated from the entire area of the specimen, consisting of all fields whether complete or not) >5.15 cells/10 mm2 [43].