What is considered severe anemia?

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Mild anemia corresponds to a level of hemoglobin concentration of 10.0-10.9 g/dl for pregnant women and children under age 5 and 10.0-11.9 g/dl for nonpregnant women. For all of the tested groups, moderate anemia corresponds to a level of 7.0-9.9 g/dl, while severe anemia corresponds to a level less than 7.0 g/dl..
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Mild anemia corresponds to a level of hemoglobin concentration of 10.0-10.9 g/dl for pregnant women and children under age 5 and 10.0-11.9 g/dl for nonpregnant women. For all of the tested groups, moderate anemia corresponds to a level of 7.0-9.9 g/dl, while severe anemia corresponds to a level less than 7.0 g/dl..
Iron-deficiency anemia can range from mild to severe. People with mild or moderate iron-deficiency anemia may not have any signs or symptoms. Symptoms generally worsen as anemia becomes more severe. If left untreated, iron deficiency can cause complications and may be life-threatening.
Stage 1 – Storage Depletion – Lower than expected blood ferritin levels. Ferritin is the storage form of iron, and low ferritin levels are the first sign that the body's iron stores are compromised. Stage 2 – Mild Deficiency- During the second stage of iron deficiency, transport iron ( known as transferrin) decreases.
Seek immediate medical care (call 911) if you develop serious symptoms such as difficulty breathing or chest pains. Seek prompt medical care if you are being treated for iron deficiency anemia but have persistent or recurrent mild symptoms..
Tests for anemia at home are: HemaApp smartphone app estimates hemoglobin concentrations. Masimo Pronto uses a sensor clipped to the finger. Biosafe Anemia Meter and the HemoCue use a finger prick to test blood.