Abby77, it's just a way of saying folate needs to be higher than 4. 18.7 is good. Folate is B9. B9 and B12 are synergistic. Do you know what your B12 result is?
Abby, those numbers are not high enough for ferritin or B12. Take another look at the link I posted first. You are having a problem with iron and iron is quite important for converting your T4. B12 should also be closer to top of range. You need to supplement both I would think.
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