When a person is under therapy of iron or mulitvitamin preparations enriched with iron, regular monitoring of the level of iron in the blood is necessary, namely:
7 to 10 days after taking oral iron therapy
3 days after receiving intravenous iron therapy,
1 month after receiving intramuscular iron therapy.
24-48 hours prior to blood collection, it is not recommended to take Vitamin C, drinking a drink that can affect your blood iron level (blueberries, black currants, blackberries, red beets …).
Blood collection should be performed in the morning and on an empty stomach.
It is also recommended to measure serum ferritin, which in turn shows the body's iron stores.