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Teo,
If she is taking B12 and folate supplements, then her blood serum reading would be higher. To get a better understanding of her B12 and folate, it's best to stop all supplements at least four days prior to testing. The low end of B12 reference range your lab is using is actually too low and anything under 400 should be further investigated. Blood serum B12 is the least accurate way to assess b12 status.
I also want to point out that not everyone can convert some forms of B12 and folate supplements so that the body can use them. If they cannot convert them, they tend to stay in the blood.
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Marlene, wife to John DX w/SAA April 2002, Stable partial remission; Treated with High Dose Cytoxan, Johns Hopkins, June 2002. Final phlebotomy 11/2016. As of July 2021 HGB 12.0, WBC 4.70/ANC 3.85, Plts 110K.
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