A System for Non-invasive Assessment of Blood Hemoglobin Level in Screening Tests

Development and Validation of a Photoplethysmography System for Noninvasive Monitoring of Hemoglobin Concentration

“…At the same time, in order to increase the sensitivity of Hb detection, the wavelength interval should be selected as small as possible in a region where the absorption coefficient changes drastically, and the wavelength interval can be slightly larger in a region where the variation is blunt. erefore, we eventually developed the probe sensor, which consists of eight LEDs with wavelengths from 610 nm to 940 nm, is capable of deriving eight channels of PPG signals with sufficiently high speed, and is different from previous studies in the choice of wavelength [11][12][13][14][15][16][17][18][19].…”

“…Furthermore, whether it is a commercial product or a prototype of laboratory research, the wavelengths of LED light sources for Hb monitoring devices are not exactly the same and have their own characteristics. According to the previous studies, the number of wavelengths for LEDs used for noninvasive Hb detection ranges from two to nine, while the wavelength range covers substantially 660 nm to 1348 nm [11][12][13][14][15][16][17][18][19]. In fact, the choice of wavelength range is very important.…”

“…With eight regression machine learning algorithms, Reşit Kavsaoglu proposed a noninvasive method for the prediction of the Hb values using the characteristic features of the PPG signals and the results were promising [18]. In 2017, Konyukhov et al developed a system consisting of computer-based software and a PPG signal acquisition module (including LED with wavelengths of 658, 776, 974, and 1348 nm) for noninvasive assessment of Hb level [19]. Noninvasive Hb measurement is still growing popularity and allows an immediate estimate of clinically significant blood loss and has significantly improved perioperative transfusion practices and even has helped enhance the quality of care.…”