Owing to the invasiveness of diagnostic tests for anaemia and the costs associated with screening for it, the condition is often undetected. Here, we show that anaemia can be detected via machine-learning algorithms trained using retinal fundus images, study participant metadata (including race or ethnicity, age, sex and blood pressure) or the combination of both data types (images and study participant metadata). In a validation dataset of 11,388 study participants from the UK Biobank, the metadata-only, fundus-image-only and combined models predicted haemoglobin concentration (in g dl–1) with mean absolute error values of 0.73 (95% confidence interval: 0.72–0.74), 0.67 (0.66–0.68) and 0.63 (0.62–0.64), respectively, and with areas under the receiver operating characteristic curve (AUC) values of 0.74 (0.71–0.76), 0.87 (0.85–0.89) and 0.88 (0.86–0.89), respectively. For 539 study participants with self-reported diabetes, the combined model predicted haemoglobin concentration with a mean absolute error of 0.73 (0.68–0.78) and anaemia an AUC of 0.89 (0.85–0.93). Automated anaemia screening on the basis of fundus images could particularly aid patients with diabetes undergoing regular retinal imaging and for whom anaemia can increase morbidity and mortality risks.
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The data supporting the findings of this study are available, with restrictions, from the UK Biobank24.
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This research was conducted using the UK Biobank Resource under application number 17643. The work of A.H. was done via Advanced Clinical, San Francisco, USA. The authors thank C. Angermueller from Google Research for his engineering contributions and A. Zaidi, A. Narayanaswamy, C. Chen, J. Krause and R. Sayres from Google Research for their advice and assistance with reviewing the manuscript.
The authors are employees of Google and own Alphabet stock or are working at Google. A.M., A.V.V., L.P. and D.R.W. are inventors on a patent applied by Google related to this work (current status: pending).
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Supplementary Methods, Supplementary Table 1 and Supplementary Figs. 1–8.
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Mitani, A., Huang, A., Venugopalan, S. et al. Detection of anaemia from retinal fundus images via deep learning. Nat Biomed Eng 4, 18–27 (2020). https://doi.org/10.1038/s41551-019-0487-z
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