The hemoglobin test is often used to check for anemia, usually along with a hematocrit or as part of a complete blood count (CBC). The test may be used to screen for, diagnose, or monitor a number of conditions and diseases that affect red blood cells (RBCs) and/or the amount of hemoglobin in the blood. Hemoglobin is the iron-containing protein found in all red blood cells that enable RBCs to bind to oxygen in the lungs and carry it to tissues and organs throughout the body.
Since a hemoglobin level is often performed as part of a complete blood count (CBC), results from other components are taken into consideration. A rise or drop in the hemoglobin level must be interpreted in conjunction with other parameters, such as RBC count, hematocrit, reticulocyte count, and/or red blood cell indices. Age, sex, and race are other factors to be considered. In general, hemoglobin mirrors the results of the RBC count and hematocrit.
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