Iron is a mineral that is essential for many bodily functions, including the production of red blood cells, which carry oxygen throughout the body. Iron deficiency can lead to fatigue, weakness, and shortness of breath. In severe cases, it can cause anemia, a condition in which the blood does not have enough healthy red blood cells.
There are several ways to check iron levels. A blood test is the most common method. A blood test can measure the amount of iron in your blood, as well as the amount of a protein called ferritin, which stores iron in the body. A low ferritin level may indicate iron deficiency.