Hemoglobin Estimation Techniques: A Survey of Conventional Methods, Clinical Relevance, and Machine Learning ApproachesPranab Gharai, Avijit Kumar Chaudhuri, Daizy Deb and Ayantika DasITM Web Conf., 86 (2026) 01023DOI: https://doi.org/10.1051/itmconf/20268601023