A new device to check sperm counts has been developed by researchers at the University of Virginia.
The SpermCheck Fertility test helps couples identify whether a male is infertile.
The device allows the test to be conducted in privacy without professional help.
The new device will soon be available in Europe and is undergoing a Food and Drug Administration review for marketing in the US.
225 semen samples were used to compare the accuracy of the SpermCheck Fertility test with standard laboratory sperm count methods, which found the tests to have a 96% accuracy rate.
Much of the research, which was published in the Journal of Human Reproduction, was funded by the National Institutes of Health.