Optimum Wavelengths on Haemoglobin Concentration Measurement

Hemoglobin is significant part of red blood cell to transport the oxygen and carbon dioxide. The concentration of hemoglobin in the blood can be used to determine a person's health condition. These days, accurate and reliable measurement of hemoglobin concentration is done by using invasive method such as cyanmethemoglobin and automated hematology analyser. Yet this method is costly, high risk of infection, and requires particular technique. Non-invasive method offers a better alternative because it has low-risk infection, obtain faster result, and portable. One of non-invasive method is photoplethysmography. This method used light with particular wavelengths to determine hemoglobin concentration. This work used blood drawn from vena and multispectral sensor to determine the wavelength that had correlation to the difference of haemoglobin concentration. Linear regression was used to determine the wavelength ratios that had higest correlation to haemoglobin concentration. The result showed that 615/455 nm wavelength had highest correlation to the change of hemoglobin concentration. These wavelengths could be used to measure the hemoglobin concentration noninvasively.