Laboratory investigations demonstrated iron deficiency anemia (hemoglobin 8.1 g/dL, serum iron 2 μmol/L, ferritin 14.4 μg/L, total iron-binding capacity 68 μmol/L, transferrin saturation 2.9%), and hypokalemia (potassium 2.7 mmol/L). This evidence concerns the gene TF and anemia.