I've had 2 Pfizer doses and was wondering if it's worth it to do a commercial antibody test to assess if I've had an adequate immune response and check antibody levels. This can also be used to decide whether to go for a 3rd booster shot if/when these become available.
Has anyone done this and do you think it would be useful?
I'm a bit surprised by this. The entire logic behind booster doses for the immunocompromised (which several countries are already doing, e.g. US/UK) is based on a lack of (or low) immune response to the vaccine, which can be confirmed by an antibody test (measuring antibodies to the spike protein). There are studies with large numbers of people where you can see the median levels of antibodies in healthy adults and compare results (e.g. here and here). These tests are quantitative and give you a number, not just a positive or negative result, some people c... (read more)