Reticulocytes are newly produced, relatively immature red blood cells (RBCs). A reticulocyte test determines the number and/or percentage of reticulocytes in the blood and is a reflection of recent bone marrow function or activity.
Red blood cells are produced in the bone marrow, where blood-forming (hematopoietic) stem cells differentiate and develop, eventually forming reticulocytes and finally becoming mature RBCs. Reticulocytes are approximately 24% higher in volume in comparison with mature RBCs. Unlike most other cells in the body, mature RBCs have no nucleus, but reticulocytes still have some remnant genetic material (RNA). As reticulocytes mature, they lose the last residual RNA and most are fully developed within one day of being released from the bone marrow into the blood. The reticulocyte count or percentage is a good indicator of the ability of a person's bone marrow to adequately produce red blood cells (erythropoiesis).
RBCs typically survive for about 120 days in circulation, and the bone marrow must continually produce new RBCs to replace those that age and degrade or are lost through bleeding. Normally, a stable number of RBCs is maintained in the blood through continual replacement of degraded or lost RBCs.
A variety of diseases and conditions can affect the production of new RBCs and/or their survival, in addition to those conditions that may result in significant bleeding. These conditions may lead to a rise or drop in the number of RBCs and may affect the reticulocyte count.
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Acute or chronic bleeding (hemorrhage) or increased RBC destruction (hemolysis) can lead to fewer RBCs in the blood, resulting in anemia. The body compensates for this loss or to treatment of deficiency anemias (such as iron deficiency anemia or pernicious anemia) by increasing the rate of RBC production and by releasing RBCs sooner into the blood, before they become more mature. When this happens, the number and percentage of reticulocytes in the blood increases until a sufficient number of RBCs replaces those that were lost or until the production capacity of the bone marrow is reached.
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Decreased RBC production may occur when the bone marrow is not functioning normally. This can result from a bone marrow disorder such as aplastic anemia. Diminished production can also be due to other factors, for example, cirrhosis of the liver, kidney disease, radiation or chemotherapy treatments for cancer, a low level of the hormone erythropoietin, or deficiencies in certain nutrients such as iron, vitamin B12, or folate. Decreased production leads to fewer RBCs in circulation, decreased hemoglobin and oxygen-carrying capacity, a lower hematocrit, and a reduced number of reticulocytes as old RBCs are removed from the blood but not fully replaced.
Occasionally, both the reticulocyte count and the RBC count will be increased because of excess RBC production by the bone marrow. This may be due to an increased production of erythropoietin, disorders that cause chronic overproduction of RBCs (polycythemia vera), and cigarette smoking.
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11dhTxB2/Creatinine (AspirinWorks), Absolute Reticulocytes, Alpha-1 Antitrypsin Phenotype, Alpha-1-Antitrypsin, Serum, Ammonia, Angiotensin-1-Converting Enzyme, Beta-2 Glycoprotein I Ab, IgA, Beta-2 Glycoprotein I, IgG, Beta-2 Glycoprotein I, IgM, Bicarbonate (HCO3), Serum, C-Reactive Protein (CRP), C-Reactive Protein, Cardiac, Copper, Serum or Plasma, D-Dimer, D-Dimer, Quantitative, Delta Aminolevulinic Acid, Urine, 24 Hour, Erythropoietin (EPO), Serum, F2-Isoprostane, Factor IX Activity, Factor V Leiden Mutation, Factor VII Activity, Factor VIII Activity, Factor X Activity, Factor XI Activity, Ferritin, Ferritin (female range), Fibrinogen Activity, Fibrinogen Antigen, Glucose 6-Phosphate Dehydrogenase (G6PD), Quantitative, Haptoglobin, Hemoglobin A, Hemoglobin F, Immatue Reticulocyte Fraction, Immature Platelet Fraction, Immature Retic Fraction, Iron, IRON (Serum), Lactate Dehydrogenase (LDH or LD), Large Unstained Cells (LUC), Large Unstained Cells (Percent), Macrocytosis, Magnesium, RBC, Nucleated RBC (NRBC) (%), Nucleated red blood cell (NRBC), OxPL-apoB1, Plasminogen Activator Inhibitor 1 (PAI-1) Activity, Platelet Ab, Indirect (IgA), Platelet Ab, Indirect (IgG), Platelet Ab, Indirect (IgM), Plateletcrit (PCT), Polychromasia, Porphobilinogen Deaminase, Whole Blood, Porphyrins, Total Serum, PTT-LA Screen, Retic Hgb Equivalent, Reticulocyte Count, Reticulocyte hemoglobin, Reticulocyte, Absolute, Sickle Cell Screen, Stomatocytes, Thrombin Antithrombin Complex, Thrombocytes, Total iron-binding capacity (TIBC), Transferrin, Transferrin Receptor, Transferrin saturation (Iron Saturation), UIBC
