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Advancements in high-throughput technologies have made it feasible to study thousands of biological pathways simultaneously for a holistic assessment of health and disease risk via 'omics platforms. A major challenge in 'omics research revolves around the reproducibility of findings-a feat that hinges upon balancing false-positive associations with generalizability. Given the foundational role of reproducibility in scientific inference, replication and validation of 'omics findings are cornerstones of this effort. In this narrative review, we define key terms relevant to replication and validation, present issues surrounding each concept with historical and contemporary examples from genomics (the most well-established and upstream 'omics), discuss special issues and unique considerations for replication and validation in metabolomics (an emerging field and most downstream 'omics for which best practices remain yet to be established), and make suggestions for future research leveraging multiple 'omics datasets.

Find the Needle in the Haystack, Then Find It Again: Replication and Validation in the ‘Omics Era