Most of COVID-19 antibody test can only test for past infection.
LumiSTAR SARS-CoV-2 One-Step Neutralizing Antibody Detection Kit can give you more information：
Detect effective neutralizing antibody!
Effective neutralizing antibody can block combination of COVID-19 spike protein and ACE2, therefore protect people against COVID-19.
LumiSTAR SARS-CoV-2 One-Step Neutralizing Antibody Detection Kit
Can Be Used in Full Cycle of Vaccine Development
Effective COVID-19 neutralizing antibody test is your passport for traveling around the world.
People with vaccinations do not really mean that they have effective protectivity against COVID-19.