While unequally resourced partners from the so-called global South are often considered ‘mere sample providers’ in larger international genomics collaborations, in this paper, we show how they strategically work to mobilize their role in a global system of tissue exchange to deliver services for local communities. We unpack how a prenatal diagnostic service for thalassemia in Pakistan emerged out of the maneuvering efforts of internationally connected Pakistani researchers. By tracing the distributed capacities that emerged and circulated as they set about improving medical genetics in Pakistan, we outline some key conditions that led to the establishment of the service: first, the scale of unmet needs that geneticists faced when collecting data as part of their research that made medical genomics a relevant field; secondly, joint efforts between researchers and physicians that were engaged with the challenge of decreasing disease prevalence through diagnostics and abortion; and finally, the ways in which international research collaborations helped generate resources to improve medical genetics in Pakistan. To understand how genetic research and medicine is currently being developed in Pakistan, we need to ethnographically re-center our analyses in ways that allow us to identify the resourceful ways in which researchers maneuvre to secure locally relevant outcomes.