I see a lot of people looking at the Tokyo Govt website and concluding "Tokyo is only testing 300 people a day or "1/3 to 2/3 of people in Tokyo are testing positive for coronavirus". While the testing numbers are still very low compared to other capitals, this is not the case 1/

The figures given under 検査実施人数/Number of people tested don& #39;t include tests conducted at medical facilities covered by insurance. They don& #39;t currently give the breakdown but when they have, these make up the majority of tests 2/ https://twitter.com/ryutakahashi217/status/1251054549898391552?s=20">https://twitter.com/ryutakaha...

However, the positive cases are INCLUDED in the 陽性患者数/number of confirmed cases figures on a daily basis regardless of how the test was conducted. This means it& #39;s not possible to get a test-positivity rate from this data as they& #39;re not measuring the same thing. 3/

The other tests are added to the 検査実施件数/number of tests conducted data every Friday through to the previous Wednesday (e.g. now updated to April 22 and will stay that way until Friday). The discrepancy is large -- e.g. April 276 people tested but 1,607 tests conducted. 4/

One caveat: the tests conducted figure would also include some people who were tested twice, which is one of the requirements to be released. It& #39;s not clear how many people that would be. 5/

Yes, this a very unhelpful way for Tokyo to present the data and presumably is a quirk of the way its collated. The testing done is still very low compared to other capitals, so there& #39;s no need to exaggerate it. On a national basis Japan is doing about 5000-7000 tests/day. 6/end