I know of this Quest issue BUT my doc sent my last bloodwork to Medical Clinical Lab here in Santa Monica and they errored on their test also. She had to have it re-done at Speciality Labs in Valencia, CA. What had to be done was the first lab sent the remainder of my blood to Speciality to have the test re-done. Labs keep “left over” blood for one month the doc told me.
My thinking is that so many are now becoming aware of this deficiency and more and more labs are getting this request.
Quest I would think should know how to do the Vit D test though. jam