Do you take a B Complex or Biotin supplement which are known to give false results for blood tests when Biotin is used in the testing procedure (as County Pathology do as confirmed by Medichecks in the past) so we have to leave these supplements off for 7 days before any blood test.
In your position I would query your result with Thriva if the tests have both been done close together and no Biotin/B Complex taken in the days before the test. Ask them to explain the difference in the results.
Hi OforOnward, I'm soooo jealous - my NHS result was 2.3 (3.4-12.2). All joking aside - testing does seem to be a bit of a minefield. I hope you get a resolution that you can be confident with.
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