For infants, the sample may be obtained by pricking the heel. The blood sample is sent to a lab for analysis. You can return to your usual activities immediately after the sample is taken. Normal ranges for children vary with age and sex. The range for a normal hemoglobin level may differ from one medical practice to another.
If your hemoglobin level is lower than normal, you have anemia. There are many forms of anemia, each with different causes, which can include:. If you've been previously diagnosed with anemia, a hemoglobin level that's lower than normal may indicate a need to alter your treatment plan. If you've been previously diagnosed with polycythemia vera, an elevated hemoglobin level may indicate a need to alter your treatment plan. If your hemoglobin level is below or above normal, your doctor may want to evaluate the hemoglobin test results along with those of other tests, or additional tests may be necessary, to determine next steps.
Explore Mayo Clinic studies of tests and procedures to help prevent, detect, treat or manage conditions. A hemoglobin blood test helps doctors check the level of red blood cells. Red blood cells deliver oxygen to the different parts of the body.
Doctors will order a hemoglobin test to check for low or high levels of red blood cells. They might do this as part of a routine checkup to screen for problems and or because a child isn't feeling well.
Your healthcare provider can use your hemoglobin test to help find the cause of your anemia. These are other reasons you may need this test:. Polycythemia is a disease that causes your body to make too many red blood cells. Polycythemia may cause:. Hemoglobin is usually tested as part of a complete blood count, or CBC.
A CBC is a blood test that counts all the different cells in your blood. A hemoglobin test may also be paired with a hematocrit test. When the two are tested together it is often called an H and H.
The hematocrit blood test tells what percent of your blood is made up by red blood cells. Test results may vary depending on your age, gender, health history, the method used for the test, and other things. Your test results may not mean you have a problem.
Ask your healthcare provider what your test results mean for you. MCHC is the average concentration of hemoglobin in your red blood cells. Find out how a low MCHC level is diagnosed and what conditions it may point…. Sideroblastic anemia is a group of blood disorders.
In all cases, the bone marrow has difficulty producing normal, healthy red blood cells. Normal hemoglobin levels can vary based on several factors, including age and sex. The presence of Heinz bodies on a blood smear test indicates oxidative damage to the hemoglobin in red blood cells.
Conditions associated with Heinz…. Health Conditions Discover Plan Connect. Why do I need the Hgb test? What are the ranges for the test results? What are the symptoms of low hemoglobin? What are the causes of low hemoglobin? What are the symptoms of high hemoglobin?
What are the causes of high hemoglobin? The takeaway.
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