Only a few suppliers are registered in Singapore to distribute test kits and they are only allowed to supply to medical clinics. This is based on the approval of Health Sciences Authority (HSA) and Ministry of Health (MOH).
The quality and accuracy of the test kits sold online cannot be guaranteed. Moreover, there is no way to ensure the patients are conducting the tests properly and that their results are accurate.
In Singapore, doctors have to undergo training in order to perform these rapid tests in the clinic. This is to ensure that the results are accurate and also treatment can be provided as soon as possible.