AKT-4687

AKT-4687

A 50-year-old woman with a history of hypothyroidism presents with fatigue and a painful tongue. Her blood tests reveal the following results:

– Hemoglobin (Hb): 10.7 g/dl
– Mean corpuscular volume (MCV): 121 fl
– Platelet count (Plt): 177 * 109/l
– White blood cell count (WBC): 5.4 * 109/l

Further investigations reveal that her vitamin B12 levels are 64 ng/l (normal range: 200-900 ng/l) and her folic acid levels are 7.2 nmol/l (normal range: > 3.0 nmol/l). Antibodies to intrinsic factor are also detected. What is the most appropriate course of action?