Professor Sharon Peacock, director of the National Infection Service, Public Health England (PHE) told the Science and Technology Committee that 3.5 million tests had been bought and would be available in the "near future".
MPs have heard that the public will be able to conduct coronavirus antibody tests at home within a matter of days, rather than weeks and months.
Prof Peacock said the tests would also allow key workers - like doctors and nurses - to go back to work if they have developed antibodies.
She also explained that a small number of tests would be tested in a laboratory before being distributed via Amazon and in places like Boots.
The test, which looks like a pregnancy test and involves pricking the finger to produce a drop of blood, which is then analysed by the device, will first be validated in Oxford to make sure it works correctly.
It will then be available to test healthcare workers and also the general public.