Studies on efficacy of HCQ for COVID-19 must employ zinc+hydroxychloroquine+azythromycin to be of value (zinc is what ultimately kills the virus), and the therapy must be administered as early as possible, upon the presentation of COVID-19 symptoms or suspicion of COVID. Tests are so unreliable (https://www.covid-19forum.org/index.php?topic=357.0) test results should not be waited for or depended upon to make a clinical treatment decision, since waiting a couple days for a result is time that the COVID19 patient may not have, and a false negative test could wind up costing an elderly or high risk patient their life. One doctor who was COVID positive, tested negative 5 times, before he tested positive. (https://www.covid-19forum.org/index.php?topic=82.0)
This is a doctor that started treatment upon suspicion of symptoms, which is the way perhaps thousands of doctors all around the world, are treating this disease.
https://www.youtube.com/watch?v=Y6gDletOCHc
Note when this doctor began treatment on frail elderly (COVID positive) patients in a nursing home environment - as soon as there was a slight reduction in blood oxygen.
https://vimeo.com/447652557