We are happy to present an analysis of the data quality from the FAIRVASC registries. The Data Quality Team on behalf of the consortium conducted an analysis of the following domains: uniqueness, consistency, completeness and correctness. Registries achieved a score of 100% in terms of uniqueness and consistency of data. The remaining parameters were not less than 94.3% when measured across all registries. These results allow us to consider federated data reliable and suitable for statistical analysis, and provide valuable guidance for further improving the quality of FAIRVASC data.