Does this test have other names?
Reticulocyte (reh-TICK-you-loh-SITE) count, retic
What is this test?
This test measures the number of reticulocytes in your blood.
Reticulocytes are immature red blood cells that are still developing. The test finds out whether the marrow inside your bones is making red blood cells the way it should.
Red blood cells flow throughout your bloodstream. They bring in fresh oxygen and take away carbon dioxide. If your body doesn't make enough red blood cells, you may have a condition called anemia.
You may have anemia if your body doesn't have enough iron. This causes a condition called iron-deficiency anemia. You may also have anemia if you have kidney disease or a blood disease such as thalassemia, which affects your body's ability to make red blood cells.
This test can be used to diagnose anemia and find out why you have a disease. The test can also help determine how serious the disease is. The test is also used to evaluate how your bone marrow is functioning.
Why do I need this test?
You may need this test if your healthcare provider suspects that you have anemia. The signs and symptoms of anemia may include:
Feeling weak and quite tired
Headaches, feeling short of breath, or chest pain
Cracks in your mouth
Swelling of your tongue
Feeling cold or numb in your hands or feet
Getting sick often
Craving nonfood substances, such as dirt or starch, which is a condition called pica
What other tests might I have along with this test?
Your healthcare provider may also order other tests, including:
Complete blood count, or CBC, to measure other substances in the blood, including hematocrit, white blood cells, platelets, and hemoglobin
Blood tests to measure the levels of iron in your blood
Tests to measure the levels of hormones, including thyroid hormones, in your blood
Fecal occult blood test to check for internal bleeding
Children may have tests to measure the levels of lead in their blood.
What do my test results mean?
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.
Results are given as a percentage. The normal level of reticulocytes in the blood is between 0.5% and 2%. If your result is 4% or higher, you may have anemia.
How is this test done?
The test is done with a blood sample. A needle is used to draw blood from a vein in your arm or hand.
Does this test pose any risks?
Having a blood test with a needle carries some risks. These include bleeding, infection, bruising, and feeling lightheaded. When the needle pricks your arm or hand, you may feel a slight sting or pain. Afterward, the site may be sore.
What might affect my test results?
Other factors aren't likely to affect your results.
How do I get ready for this test?
You may need to avoid eating or drinking anything but water before your test. Be sure your healthcare provider knows about all medicines, herbs, vitamins, and supplements you are taking. This includes medicines that don't need a prescription and any illicit drugs you may use.
December 01, 2017
Approach to the adult patient with anemia. UpToDate, McPherson. Henry's Clinical Diagnosis and Management by Laboratory Methods. 2017, 23rd ed., pp. 514-15.
Freeborn, Donna, PhD, CNM, FNP,Haldeman-Englert, Chad, MD