Spectral and temporal detection of blood bilirubin level using a point-of-care device

Bilirubin is a biomarker for liver inflammation used to assess liver functions. Its concentration in the blood has been measured using a range of techniques both in clinical and point-of-care settings. Existing point-of-care devices utilize a spectral approach, namely dual-wavelength absorption measurement, to assess the blood bilirubin concentration. This work examines a novel temporal approach based on the photodegradation of bilirubin in the blood sample. It demonstrates that combining photodegradation characteristics with dual-wavelength measurement produces a more accurate technique for measuring blood bilirubin concentration. Tracking the evolution of absorbed light as a function of time represents a low-cost and simple way of improving the accuracy of point-of-care devices for bilirubin measurements.