Establishing a National Pharmaceutical Microbiology Reference Laboratory Network Framework for Nigeria: Policy Analysis and Implementation Modelling

Nigeria lacks a coordinated national pharmaceutical microbiology reference laboratory network capable of generating standardized, nationally representative microbiological quality data for regulatory decision-making, AMR surveillance, and outbreak response. This theoretical and applied policy study developed and modelled an implementation framework for a National Pharmaceutical Microbiology Reference Laboratory (NPMRL) network for Nigeria, drawing on international reference laboratory network models and Nigerian healthcare system realities. A mixed-methods systems analysis approach was used, combining key informant interviews with NAFDAC officials, state health authorities, academic laboratory directors, and pharmaceutical industry quality managers across all six geopolitical zones. Delphi consensus methodology was used to prioritize network design features, test menu, data governance architecture, and funding modalities. Health system capacity mapping was conducted using WHO laboratory assessment tool data from 36 state laboratories and 8 federal facilities. A simulation model using Monte Carlo methods estimated network cost-effectiveness under three implementation scenarios over a 10-year horizon. Results identified 8 strategically located tier-1 reference nodes and 24 tier-2 sentinel laboratories as the optimal network structure. Priority test menus included AMR surveillance, sterility testing, and environmental mycological monitoring. A tiered funding model combining NAFDAC levies, international health security grants, and state cofinancing emerged as the most sustainable scenario. Network modeling showed a projected 39 percent reduction in drug quality failures and 28 percent reduction in AMR-attributable mortality under full implementation. This study provides an original policy framework and systems design contribution to Nigeria's pharmaceutical microbiology infrastructure. Keywords: reference laboratory network, pharmaceutical microbiology, NAFDAC, AMR surveillance, health systems.