“Today, the U.S. Food and Drug Administration issued a safety communication informing the public that results from SARS-CoV-2 antibody tests should not be used to evaluate immunity or protection from COVID-19 at any time, and especially after the person received a COVID-19 vaccination.”

https://blog.nomorefakenews.com/2021/06/29/fda-reverses-itself-rejects-covid-antibody-test-results-insanity-reigns/