Our idea is to develop BiliSpec, a bilirubin monitoring device with a per-test cost of less than $0.10. BiliSpec includes: (1) a lateral-flow device to separate serum from whole blood in under 30 seconds and (2) a battery powered reader to measure light transmission through the separated serum on the strip and display the bilirubin concentration. We estimate our device could prevent the deaths of approximately ninety-thousand neonates who die every year due to lack of access to effective treatment and monitoring for neonatal jaundice in low-resource settings.