Hm, the numbers I've dug up (though rather hastily; I haven't read much of the documents) don't really match 2.3%... they seem to be 0% in their tests. Here [1] is where I think you can find the info for all the FDA-authorized tests. I see mentions of NPA (negative percent agreement) being 100% in their trials in [2] and [3] for example, though the sample sizes don't seem too large (something like 30-50). Any idea what I'm missing, or if it's just because of small sample sizes? (I'm not exactly trained in this, but my impression was PCR was more accurate than that.)
[1] https://www.fda.gov/medical-devices/coronavirus-disease-2019...