Low Hemoglobin? Comete test or only hbc?

My son 4 years old have iron deficiency based on hemoglobin test , and doctor suggested Tonoferon syrup , for iron anemia , the same continued for 2months  and stopped, should I continue again same syrup, or is there any better syrup in recent days to address it. Is it require to take test again? Is it require you take comete test or only hbc? Test Report : Haemoglobin (EDTA Blood/Electrical Impedance) 6.8 gm Packed Cell Volume (PCV)/Haematocrit (EDTA Blood/ Derived from Impedance) 24.2 % RBC Count (EDTA Blood/Impedance Variation) 4.43 mill/cu.mm Mean Corpuscular Volume(MCV) (EDTA Blood/Derived from Impedance) 55.0 fL Mean Corpuscular Haemoglobin (MCH) (EDTA Blood/Derived from Impedance) 15.3 pg Mean Corpuscular Haemoglobin concentration(MCHC) (EDTA Blood/ Derived from Impedance) 28.1 g/dL Total Leukocyte Count (TC) (EDTA Blood/Impedance Variation) 9900 cells/cu.mm Neutrophils (Blood/Impedance Variation & Flow Cytometry) 63.6 %