It seems odd that all of the slices on Observation.component for the race and ethnicity profiles use the same LOINC code for each of the 3 slices. Is this expected to problematic in terms of validating the data for a system using the resource? While the value sets for the rolled up OMB codes and the detailed codes are mutually exclusive, it seems like the using system will need to validation each coded component against both value sets to determine that the value is valid. Is it not possible to have unique LOINC codes for each concept? If unique codes are not possible, narrative on the Draft Specification for Race and Ethnicity page on the implications of using the same code for all components may be helpful to implementers.