antibody test
The 100% accurate test could pave the way for immunity certificates and has been hailed as a lockdown "game changer".
Serology test helps determine if a patient has been exposed to the virus and may indicate some immunity.
Scientists advising ministers raised concerns that workers could face discrimination based on their "positive" or "negative" status.
Health secretary also says he is "not assuming any" of the tests will be antibody tests.