Minnesota, U.S., and World Report updated late January 4, see #7 below

[progree]

3. At home test kits and Omicron

https://kstp.com/coronavirus/omicron-tests/6346256/

Medical experts say some at-home COVID-19 tests may not be as effective in detecting omicron, 12/31/21

The Food and Drug Administration says early data shows those rapid tests can detect omicron, but that some are less effective than others.

Overall, antigen tests on the market tend to be roughly 85% effective in detecting COVID-19 ((presumably talking about Covid-19 overall, not specifically about Omicron --Progree)).

(snip)

But Binnicker says omicron’s genetic makeup may be making it hard to detect.

He advises if you test negative, and are still having symptoms, to go get a nasal swab PCR test.

It’s considered much more accurate and reliable.