ISCN 2024: Summary of Revisions and New Nomenclature

The International Standing Committee on Human Cytogenomic Nomenclature (ISCN SC) considered feedback from the cytogenomics community to provide a more user friendly and organized presentation of general rules, improved example descriptions, more representative examples, and additional abbreviations. The ISCN 2024 edition represents one of the most significant reviews. Nomenclature for describing the findings of genomic mapping has been included for the first time. A key achievement of the Committee in preparing the ISCN 2024 is the provision of standardized nomenclature to ensure consistency in the ISCN description of findings irrespective of the cytogenomic technology used. This report highlights the main changes in the ISCN 2024 compared to previous editions and is a guide to assist in the transition to its implementation as the current nomenclature for describing cytogenomic findings.