A pregnacy wristband
A “smart” wristband that can tell a woman when she is pregnant is being developed in Switzerland, as an alternative to the traditional urine-based home pregnancy test. At the American Society for Reproductive Medicine congress in Texas, the team behind the device said they had charted a range of minute physiological changes that occur after conception, probably as a result of fluctuations in levels of oestrogen and progesterone: they include changes to skin temperature, breathing rate and pulse. They are now building an algorithm that learns both the wearer’s normal characteristics and detects such changes, so that the Ava bracelet – which can already tell women when they are most fertile – can also alert them when they are pregnant, within about seven days of conception. The team, at the University of Zurich, expects the band to cost around £200.