Federated Nordic cohorts

Nordic women’s health research becomes legible at scale through prospective and register-linked longitudinal populations, including MoBa, NSHDS, the Danish biobank, FinnGen, deCODE, their federated successors, and new cohorts purpose-built for women’s life-stage data.

The cross-Nordic federation being established through the 2026 to 2030 NordForsk Nordic Biobank Network draws on the registry-linked depth that makes the Nordics distinctive for women’s health research. The missing piece is the prospective collection of menstrual, hormonal, and reproductive life-stage variables outside Denmark, where KISO and Aarhus 300k are currently the only cohorts doing so at a population scale. Two routes are open: a parallel national prospective cohort modelled on KISO methodology, or a shared Nordic prospective cohort with country-specific arms. The choice is best made collectively rather than nationally, and either would allow life-stage data to join genetic, register, and biobank data within a federated infrastructure, making Nordic cohort science the global reference for women’s health longitudinal research. The cohort PIs in dialogue, with NordForsk as funder, are positioned to make the architectural choice.