Covid Test Not Detected Negative. Its analysis suggested that the sensitivity of rapid tests to detect the omicron variant was 37 percent, compared to 81 percent for delta. The timing aspect seems to be particularly important here.
This means that the virus was not found in your sample. Experts advise that people should wait at least three days after a possible exposure to get a test. In effect, this means that if 100 people had covid and were infected with the omicron variant, only 37 of them would get a positive result and the others would get a falsely negative result.