MCH under range confirms iron deficiency anaemia. Iron infusion or tablets are the usual treatment for iron deficiency and will usually also raise ferritin which is stored iron.
Folate is deficient. Your GP should prescribe 5mg folic acid to be taken once it is established you are not B12 deficient. If you are to be given B12 injections they should be initiated 48 hours before starting folic acid tablets.
You should have vitD rechecked to make sure 3,000iu is adequate dose. VitD is replete >75 and optimal 100-150.
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