Diagnosing Anemia in Children
Anemia is a common condition in children. About 20% of children in the U.S. will be diagnosed with anemia at some point. A child who is anemic does not have enough red blood cells or enough hemoglobin. Hemoglobin is a special type of protein that allows red blood cells to carry oxygen to other cells in the body.
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Anemia has three main causes. They are a loss of red blood cells from bleeding, inability to make enough red blood cells, and a medical condition that causes the destruction of red blood cells.
In most cases, anemia can be diagnosed with a few simple blood tests. The American Academy of Pediatrics currently recommends universal screening for anemia with a hemoglobin test at one year of age. It should include an assessment for any risk factors for iron deficiency anemia. In addition, if the hemoglobin level is low, more evaluation is needed to determine the type of anemia present. If any risk factors are known to be present at any age, a test for anemia should be performed. For older children, a blood test for anemia may be done during a child’s routine physical exam.
Symptoms of anemia in children
Many children with anemia have no symptoms. That’s why it’s important for children to have routine blood tests to check for the condition. Some of the signs and symptoms that might make a healthcare provider suspect anemia in a child include:
Yellow skin color
Blood tests for diagnosing anemia
To get a blood sample, a healthcare provider will insert a needle into a vein, usually in the child’s arm or hand. A tourniquet may be wrapped around the child’s arm to help the healthcare worker locate a vein. Blood may be drawn up into a syringe or a test tube. In some cases, blood can be taken using a needle prick.
Blood tests may cause a little discomfort while the needle is inserted, and the needle may cause some bruising or swelling. After the blood is removed, the healthcare provider will remove the tourniquet, put pressure on the area, and apply an adhesive bandage.
It’s possible to have persistent bleeding, nerve damage, or infections from a blood test, but these risks are small. In most cases, a child will not need any special preparation or care after a blood test.
Most anemias in children can be diagnosed with these blood tests:
Hemoglobin and hematocrit. This is often the first screening test for anemia in children. It measures the amount of hemoglobin in the blood and the amount of red blood cells in the blood sample.
Complete blood count, or CBC. If hemoglobin or hematocrit is abnormal, a complete blood count may be done. This test adds important information about the blood, including the size of red blood cells (called the mean corpuscular volume, or MCV).
Peripheral smear. This test involves a smear of blood on a slide that is examined under a microscope. By looking at a child’s blood cells under a microscope, a lab specialist may be able to diagnose a type of anemia that causes red cells to grow or develop abnormally.
Reticulocyte count. Reticulocytes are immature blood cells. A reticulocyte count measures the percentage of newly formed red blood cells in the child’s blood sample. Anemia caused by not enough red blood cells being made results in a low reticulocyte count. Anemia caused by too many red blood cells being lost causes a high reticulocyte count.
Types of anemia in children
Once a healthcare provider has evaluated the child’s blood tests, the type of anemia can usually be determined and treatment can be started. Children’s anemia can be classified by the size of their red blood cells:
Treating anemia in children depends on the type of anemia and its cause. In some cases, treatment may need simply a change in diet or the use of diet supplements. In other cases, a blood transfusion or long-term treatment may be needed. Screening for anemia is an important part of caring for a child. Many problems caused by anemia can be prevented when anemia in children is diagnosed at an early stage.
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