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I would trust these results to be accurate, as the level was quite low. The site of blood collection would not affect the result significantly. Giving food prior to a blood draw can add more fat to the blood, which occasionally can affect test results, usually the lab will state this on the test result and recommend retesting.
Having said that, it is harder to determine if vaccination would affect the results. Since this is a potentially serious condition, it wouldn't hurt to retest him to confirm, as it is a significant issue that we would want to be 100% certain results are accurate.