{Reference Type}: Guideline {Title}: Perls' Stain Guidelines from the French-Speaking Cellular Hematology Group (GFHC). {Author}: Lours C;Cottin L;Wiber M;Andrieu V;Baccini V;Baseggio L;Brouzes C;Chatelain B;Daliphard S;Fenneteau O;Geneviève F;Girard S;Leymarie V;Maloum K;Rieu JB;Sebahoun G;Sudaka I;Troussard X;Wagner-Ballon O;Wuilleme S;Bardet V;Lesesve JF;Lours C;Cottin L;Wiber M;Andrieu V;Baccini V;Baseggio L;Brouzes C;Chatelain B;Daliphard S;Fenneteau O;Geneviève F;Girard S;Leymarie V;Maloum K;Rieu JB;Sebahoun G;Sudaka I;Troussard X;Wagner-Ballon O;Wuilleme S;Bardet V;Lesesve JF; {Journal}: Diagnostics (Basel) {Volume}: 12 {Issue}: 7 {Year}: Jul 2022 12 {Factor}: 3.992 {DOI}: 10.3390/diagnostics12071698 {Abstract}: In order to standardize cellular hematology practices, the French-speaking Cellular Hematology Group (Groupe Francophone d'Hématologie Cellulaire, GFHC) focused on Perls' stain. A national survey was carried out, leading to the proposal of recommendations on insoluble iron detection and quantification in bone marrow. The criteria presented here met with a "strong professional agreement" and follow the suggestions of the World Health Organization's classification of hematological malignancies.