For those of you who are not a member of ConsumerLab.com, I thought I'd relay the following information. I must paraphrase and not copy and paste due to copyright issues. ConsumerLab just updated their report on Vitamin D tests. They say that the most common current methods of testing Vitamin D, immunoassay tests using Abbott Architect or Siemens Centaur-2 immunoassay devices, have an increased likelihood of reporting Vitamin D levels as deficient when they are not. ConsumerLab recommends using the older established method (LC/MS), [if you know what that is, I don't!], if you are concerned that your lab results are not accurate.