WHY ARE SOME COVID-19 TEST INCONCLUSIVE?

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No test is 100% accurate If your swab test comes back positive for covid-19 then we can be very confident that you do have covid-19 However, people with covid-19 can be missed by these swab tests. If you have strong symptoms of covid-19, it is safest to self-isolate, even if the swab test does not show covid-19. RT - PCR test is positive and most reliable in most cases - but in 20 - 25 % cases - it can be false negative. There are many reasons like 1.low viral load 2.A high CT value - cycle threshold value 3.Inadequacy of the naso - pharyngeal swab specimen 4.Inexperienced and tired - technitian. In Covid antigen test - it is positive in only approximately 50 % cases as the viral load needs to be high for the specimen to be positive. Now - a days - even if the RT - PCR test is negative- but patient is having clinical symptoms of Covid-19- and Oxygen saturation is less than 95 % - we are relying on HRCT chest for the diagnosis with CORADS score of 4 and 5 taken as a strong possibility of COVID-19 disease

WHEN ONE OF THE THE TWO TARGETS BUT NOT BOTH.. PRESENT ..ABOVE THE THRESHOLD FOR POSITIVITY .. THE TEST IS REPORTED..INCONCLUSIVE.. THIS IS USUALLY SEEN WITH LOW AMOUNTS OF VIRAL DNA..

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RT PCR test has 30 % false negative rate in diagnosis of Covid 19 That is 30% of all people who actually have Covid 19, will be tested negative That is inherent deficiency in the test Covid antigen test, the false negative rate goes up to 50%

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