When I had my original blood work done my B-12 was 444 and Vit D was around 23 I think. I suggested to my Dr that I should have a list of things to be retested every 3-6 months and try to get them as close to perfect and see if my symptoms will go away. He said no I don't see a need they look fine. With that being said; has anyone had luck with a place such as LabCorp or anything of that nature? I think it seems handy to go to a place just for blood work with no questions or any greif from someone. I was just wondering if anyone out there has had any luck or bad luck with a place like this?