You've just received – or expect to receive shortly – four free coronavirus tests from the federal government, so what next? .

The Food and Drug Administration has granted emergency use authorization to a dozen home test manufacturers.

The Biden administration announced contracts with three major manufacturers – Abbott Laboratories, iHealth Lab and Roche Diagnostics – to supply the first wave of free home tests. .

Most home kits come with a second test that should be used 24 to 48 hours after the first.

Omicron will challenge our collective judgments as to when to test at home