A businessman from Dallas got a PCR test for the coronavirus at a suburban emergency room. The charge for his test was "egregious" but not illegal, say health care analysts. Here's what happened.
The standard test for infection with the coronavirus looks for a genetic fingerprint. Laboratory errors, including contamination, can lead to false results, a problem seen with environmental testing.
An antigen test could be quick, and much simpler and cheaper than the PCR tests now used to spot people infected with the novel coronavirus. But some scientists worry about an antigen test's accuracy.