you are being given 3 ranges and told what the results mean if they fall into those ranges. At 2.6 the result fits into the third of the rangers - under 3.4ug/L.
This means that your daughter does not have enough folate in her blood - and she needs a lot more.
Low folate will mean amongst other things that she is unable to process B12 properly which will make her more susceptible to infections ... and if I understand the other results correctly they are indicative of an infection.
This is a link to the BCSH guidelines on folate (B9) and cobalamin (B12) deficiencies.
Not necessarily, A rise in the ESR can happen with a cold, and sore throat, however a raise in the ESR only tells you there is some inflammation, but not where it is, so the Dr. would go by the symptoms,
Important info in Management section in link above about folate deficiency. I have read that treating folate deficiency without treating a co-existing B12 deficiency can cause problems.
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