Many thanks for all the prompt responses.
Majority view, with some published evidence, is that vit D is reasonably stable both in whole blood and the separated serum so that immediate separation and freezing is not required.
Clearly I did not read p279 of the review article in Ann Clin Bio, vol 41(4) July carefully enough.
Perhaps some labs listed on Assay Finder should review their requirements for consistency.
I had also been following information in the 2000 version of the UK SAS Hormones and Genetic Enzymes handbook, page 75.
Paul
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