There are a few different types of COVID tests: Antibody test, PCR Test, Rapid Antigen Test. Each one has its advantages.
The Finger Prick antibody test is primarily looking to see if you HAD Covid-19 and now have the Antibodies to fight the virus.
The PCR Nasal Swab will show you if you currently have the Covid-19 virus and is the only test accepted for travel.
Rapid antigen testing notifies you if you have Covid and results are available within the hour, please keep in mind that results are not as viable as the PCR