Low ferritin levels indicate iron deficiency, says MedicineNet. When iron levels are low, the body struggles to produce hemoglobin, a protein in red blood cells that allows them to carry oxygen, notes Mayo Clinic. This l... More »

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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 »

If an individual has a low ferritin level, the individual has an iron deficiency that can be caused by a variety of conditions, according to WebMD. The individual should consult a doctor to determine the cause in order t... More »

If an individual has a low ferritin level, the individual has an iron deficiency that can be caused by a variety of conditions, according to WebMD. The individual should consult a doctor to determine the cause in order t... More »

According to the Mayo Clinic, lower than normal ferritin levels are indicative that someone has an iron deficiency. Ferritin is a blood cell protein that contains iron. More »

Low sodium is caused by excess fluid in the body, according to MedicineNet. It may also be due to loss of sodium and body fluid, and it may be caused by kidney failure. Symptoms of low sodium include headache, seizures, ... More »

Low levels of PSA, or prostate-specific antigen, are considered desirable, since they indicate a lower risk for prostate cancer; readings below 4 nanograms per milliliter are considered normal, according to Health Magazi... More »