The CDC does not recommend doing this:
Antibody testing is not currently recommended to assess the need for vaccination in an unvaccinated person or to assess for immunity to SARS-CoV-2 following COVID-19 vaccination. Antibody tests currently authorized under an EUA have variable sensitivity, specificity, as well as positive and negative predictive values, and are not authorized for the assessment of immune response in vaccinated people. Furthermore, the serologic correlates of protection have not been established, and antibody testing does not evaluate the cellular immune response, which may also play a role in vaccine-mediated protection.
https://www.cdc.gov/vaccines/covid-...s.html#considerations-pfizer-biontech-moderna
The recommendation from the FDA and the CDC is to avoid overwhelming the lab systems with antibody testing of people who are fully vaccinated. In the US, we have about 230 million people who have been vaccinated and we definitely wouldn't want to try to test that number of people when we can assume that the overwhelming majority of them will have sufficient antibody response to the vaccine. The CDC also has the mistaken belief that if people know they have antibodies, they'll use that as an excuse to not wear masks or take reasonable precautions to avoid infection, a supposition that completely ignores the fact that a large number people who are vaccinated are not wearing masks or taking reasonable precautions already.
That said, we are doing studies of people who received the vaccines to assess their antibody levels of "S" neutralizing antibodies. The test is available to anyone by physician order and insurance will usually cover it. For a person who had little/no apparent immune response to the vaccines, I would recommend discussing the anti-S quantitative test with their physician. The test can be ordered through the major lab companies like Quest and LabCorp and the results will come with a disclaimer saying something like, "antibody level that correlates with immunity has not yet been determined".
I try to avoid political opinions in this thread since it's supposed to be a fact-source but I will offer that the CDC has fallen short on testing recommendations throughout this pandemic. The US does not do enough testing- either in identifying people who are infected or in monitoring variants. The FDA and CDC are relying upon the pharmaceutical companies to provide data regarding antibody levels (Pfizer's studies are coming from Israel which has done a much better job in antibody testing).
I recently heard a public health person say, "Well, 99% of the cases in the US are Delta variant". I'm not sure how that statement can be supported since the US only does variant testing about 1.6% of the positive tests.
The US had over 100,000 positive tests yesterday. They will do genotype (variant) testing on less than 2,000 of those tests.
Well this sucks for africa,
Only 6.6% of Africa's population is vaccinated.
Contact tracing of people who had this new variant (omicron) had traveled from South Africa. South Africa has vaccinated about 25% of their population.
Although, it's a little unfair to associate South Africa for this latest variant when there's a high likelihood that the same variant is circulating in the US, a country which is more likely to spread variants to other countries than South Africa.
