Whoa didn't realize it was that prevalent. I looked into it for vitamin c infusions (long story), seemed to be an easy test to find. Something they could look at while looking for covid if there is an intent to treat it?

Yes, but hydroxycholoroquine is a safer alternative.

https://www.ncbi.nlm.nih.gov/pubmed/28556555

https://onlinelibrary.wiley.com/doi/full/10.1002/acr.23296