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SATURDAY, October 01, 2022
nationthailand
Factors that contribute to false rapid test results

Factors that contribute to false rapid test results

WEDNESDAY, August 04, 2021

The Thai government agreed to allow the use of rapid antigen test kits for Covid-19 because the rate of false positives is low at just 3 per cent. However, these false positives can be caused by many factors.

In a Facebook post on July 28, Thiravat Hemachudha, chief of Chulalongkorn University’s Centre for Emerging Disease Health Sciences, said a negative result from an antigen test for an asymptomatic person does not mean they are completely free of the virus. Similarly, a positive result for an asymptomatic person does not mean they have the virus, but it is necessary for them to undergo a proper RT-PCR test.

Factors that contribute to false rapid test results
The Covid-19 Information Centre, meanwhile, has issued a list of factors that may result in false test results:


A false positive can be caused by four factors:
• Contamination of the equipment or testing area
• Presence of another virus or microorganism
• The test has been wrongly conducted
• Quality of specimen is bad


A false negative can be caused by three factors:
• The infection is just starting and there is a low amount of virus
• Specimen has been wrongly collected
• The test has been taken incorrectly like too much time spent on the reading or insufficient sample