The world’s first over-the-counter fertility test for men goes on sale this week.

The Fertell test is designed to warn of potential fertility problems. It measures the number of active sperm and gives a result in about an hour.

To conduct the test the man produces a sample, sets the device and within an hour will find out whether he has enough sperm to fertilise a female egg.

The test works by forcing sperm to swim through a barrier mimicking the female cervix. It then measures the number of sperm which get beyond this point.

If a high enough level of active sperm is present in the sample, a red line indicates a positive test.

More here.