A woman is being investigated for anaemia
A woman is being investigated for anaemia. She has a known past medical history of hypothyroidism, for which she takes levothyroxine. Bloods show:
| Hb | 97 g/L | Female (115-160 g/L) |
| MCV | 110 fL | (82-100 fL) |
| Vitamin B12 | 88 ng/L | (200-900 ng/L) |
| Folate | 6.0 nmol/L | (>3.0 nmol/L) |
| TSH | 2.2 mu/L | (0.5-5.5 mu/L) |
| Intrinsic factor antibodies | Positive |
Which of the following is the most appropriate management?
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