Amazon Halo did something similar five years ago:
https://www.amazon.science/latest-news/the-science-behind-th...
A recent clinical study, whose results haven’t been published yet, determined that [Amazon Halo's] Body is nearly twice as accurate as smart scales in measuring BFP when using DXA as the ground truth.
Some discussion on HN at the time: https://news.ycombinator.com/item?id=24295779