RE: GDR PCR - SWOT28 Jun 2020 21:28
The GDR test is not 100% accurate. The terms used are sensitivity and specificity.
Sensitivity is the percentage of people with the disease who get detected by the test and in GDR's case this is 100%.
Specificity is the percentage of people who are healthy who get identified as healthy. In GDR's case this is 98.2%.
In a population of 10,000 where 1% (I.e.100) have the disease, the GDR test will correctly identify all those who have the disease but it will also identify 178.2 who do not have the disease as having the disease. However if it says you haven't got it, you haven't got it – all 9,721.8 of you which obviously saves a lot of extra testing.
There is a company in the US Quidel which has a 15 minute point of care test. On the face of it this is ideal – no lab involvement and an immediate result. Sadly for them, their sensitivity is only 80% which means that 1 in five with the disease is being missed and being released into the population to reinfect. Clearly GDR has the better problem but it is not correct to say that it is 100% accurate.