3rd May 2024

A 15-year-old girl presents with fatigue, pallor, and shortness of breath on exertion. She has a history of heavy menstrual bleeding.

A 15-year-old girl presents with fatigue, pallor, and shortness of breath on exertion. She has a history of heavy menstrual bleeding. Her diet is primarily vegetarian. On examination, her heart rate is 105 bpm and her blood pressure is 110/70 mmHg. Laboratory tests show a haemoglobin level of 85 g/L (8.5 g/dL), mean corpuscular volume (MCV) of 70 fL, and low serum ferritin.

Which is the most appropriate next step in management?