Causes of a low ferritin level include chronic bleeding in the digestive tract, heavy menstrual bleeding, iron-deficiency anemia and problems absorbing iron, explains MedlinePlus. Ferritin is a protein that stores iron i... More »

Ferritin is a protein in the body's cells that is responsible for the storage of iron, according to Healthline. Cells irelease ferritin when they receive a signal that the body needs more red blood cells. The ferritin bi... More » Health Medications & Vitamins Vitamins & Supplements

A ferritin serum test is a blood test that measures the amount of ferritin in the blood, states Mayo Clinic. Ferritin is a protein that binds to iron, according to Healthline. More » Health Diagnostics & Imaging

Symptoms of low iron in the blood, or iron-deficiency anemia, include weakness, fatigue, shortness of breath, pale skin and dizziness, according to Healthline. Soreness or swelling of the tongue, a feeling of tingling in... More »

A low hematocrit level may mean the patient is malnourished, anemic, overhydrated or bleeding, according to MedlinePlus. A low hematocrit level may also be due to nutritional deficiencies, leukemia or the destruction of ... More » Health Medical Ranges & Levels

Normal ferritin levels increase as children grow older, but for teenagers and young girls, the normal range is 7 to 140 nanograms per milliliter, according to WebMD. For adult women, the range is 18 to 160 nanograms per ... More »

The causes of a low sodium level include dehydration, kidney problems, severe vomiting or diarrhea, hormonal changes and the use of certain medications, states Mayo Clinic. Low sodium levels are also caused by heart prob... More » Health Medical Ranges & Levels