Hemoglobin Concentration Measurements with the Reflectance Mode Photoplethysmography

We confirm possibility of noninvasive measurements of hemoglobin concentration by means of wrist wearable device. The dataset consists of 170 volunteers with the reference hemoglobin concentrations in the range of 65–176 g/L. The developed algorithm predicts hemoglobin concentration with the mean absolute error as low as 6.8 g/L and correlation coefficient with the reference blood test equal 0.66.