We recently saw the case of Ohio Governor Dewine and the concern was oddly political rather that scientific as to the precision and accuracy of the test.
Following this I read this from UPMC with respect to the precision and accuracy of testing.
Among 418 patients who first tested negative and were retested, 96.4% were negative when retested, according to the study. For the 15 patients who went from negative to positive in testing, the median time between tests was eight days.
And when the 74 patients who tested positive initially were retested, about half were still positive and half were negative, according to the study.
The study offers guidance in the use of COVID-19 tests, which can sometimes be scarce, said Graham Snyder, medical director of infection prevention and hospital epidemiology at UPMC.
With respect to testing negative I would say a 96.4% retest confirmation is pretty good.
With respect to POSITIVE testing the report appears to gloss over the abysmal 50% retest confirmation. It was only 74 retests so no reason to panic and think this is the national statistic…yet still it is concerning and makes me wonder just what the number is for all testing platforms combined.
If this is as high as 10-25% that is a poor result…especially when political decisions are being made by gross case count rather than medical system demand and response.
I would welcome any added data on false positive rate and platform reliability.