This seems unfair to the poor who can't afford to pay OOP so I'm going to circle back on Monday because I am hoping we are not all just supposed to fend for ourselves
NY state is a "scientific fact and data" based state. As such, from Day 1 & Day 2, when we had the first 2 known cases on the east coast, our state's Dept of Health as well as NY City's Dept of Health have believed it is necessary to collect the number of positive COVID-19 as well as the positive antibody numbers, as it helps
them establish what is happening in our state. So, we are lucky to have state funding focused on providing free COVID-19 testing as well as antibody testing. (Everybody, check your own state's Dept of Health to see if they offer free testing.)
The Commissioner of the NYS Dept of Health worked closely with Abbott Architect to create the two tests for accuracy, which are now being used by NYS and Abbott (and approved by the FDA,) at the free testing sites.
Antibody tests help to determine where the spread of COVID has been. Especially in the people who were never sick enough to have to go to the hospitals, as well as the potential number of asymptomatic people out there. (Dr. Redfield, director of the CDC, said just a couple days ago at the Congressional Hearing, that he estimates that there are currently up to 10 times the number of unknown cases, over the known, tested COVID cases logged.) It also helps determine how close we are to "herd immunity" IF there actually will be such a thing for COVID-19. NYC became the epicenter of the U.S., then the world, with the most cases. (Until Brazil recently took over that moniker.) Yet, we are currently only at about 26% of the population of NYC is positive for antibodies.

It is estimated that there needs to be about 70% to get to herd immunity.
I supposed, IF it is determined that we do have herd immunity, that is important for the insurance companies to know. Down the line, they won't have so many COVID-19 patients to pay for. There are some patients who've been on ventilators for 30-60 days. One man here was on a ventilator close to 60 days and recovered. Then he was sent his medical bill, with the hospital stay and all the various treatments he had needed. The bill was over $1.1 million dollars. Luckily, his medical insurance will cover the majority of those charges.
I also think an insurance company would want to have their own research on how many of
their own clients have antibodies, what are the demographics and comorbidities that lived through it. They won't get that info from the general antibody test study results put out by states and other entities.