The impact of reagent costs on access to diagnostics in developing countries

When I volunteered at a small clinic abroad, I was surprised to see how rarely they could run molecular tests, even for common infections. The staff explained that reagents were so expensive compared to their budget that they had to ration tests, only using them for the most severe cases. It made me think about how labs in lower-income regions manage to keep diagnostics running at all. Does anyone here know ways clinics overcome that barrier?