We are making several updates to the SFCU concept to mitigate some of these sorts of concerns, including renaming it from Sex for Clinical Use to Sex Parameters for Clinical Use. New name :  Sex Parameter for Clinical Use New Description :  A Sex Parameter for Clinical Use is a parameter that provides guidance on how a recipient should apply settings or reference ranges that are derived from observable information such as an organ inventory, recent hormone lab tests, genetic testing, menstrual status, obstetric history, etc.  This property is intended for use in clinical decision making, and indicates that treatment or diagnostic tests should consider best practices associated with the relevant reference population.  When exchanging these concepts, refer to the guidance in the  [Gender Harmony Implementation Guide] ( http://hl7.org/xprod/ig/uv/gender-harmony/ ). This will likely be placed in Chapter 3 Section 3.4.21.