Pernicious Anemia (B Vitamin Deficiencies)

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Pernicious anemia is a condition in which the body does not make enough of a substance called 'intrinsic factor'. Intrinsic factor is a protein produced by parietal cells in the stomach that binds to vitamin B12 and allows it to be absorbed from the small intestine. Vitamin B12 is important in the production of red blood cells (RBCs). Without enough intrinsic factor, the body cannot absorb vitamin B12 from the diet and cannot produce enough normal RBCs, leading to anemia. In addition to lack of intrinsic factor, other causes of vitamin B12 deficiency and anemia include dietary deficiency and conditions that affect absorption of the vitamin from the small intestine such as surgery, certain drugs, digestive disorders (Celiac disease, Crohn's disease), and infections. Of these, pernicious anemia is the most common cause of symptoms. Vitamin B12 deficiency can result in general symptoms of anemia as well as nerve problems. These may include: weakness or fatigue; lack of energy; numbness and tingling that start first in the hands and feet. Additional symptoms may include muscle weakness, slow reflexes, loss of balance and unsteady walking. Severe cases can lead to confusion, memory loss, depression, and-or dementia. Folic acid is another B vitamin, and deficiency in this vitamin may also lead to anemia. Folic acid, also known as folate, is found in many foods, especially in green, leafy vegetables. Folic acid is added to most grain products in the United States so that deficiency in folic acid is rarely seen in the U.S. today. Folic acid is needed during pregnancy for normal development of the brain and spinal cord. It is important for women considering pregnancy to take folate supplements before they get pregnant and during pregnancy to make sure they are not folate deficient. Folate deficiency early in pregnancy can cause problems in the development of the brain and spinal cord of the baby. Anemias resulting from vitamin B12 or folate deficiency are sometimes referred to as “macrocytic” or “megaloblastic” anemia because red blood cells are larger than normal. A lack of these vitamins does not allow RBCs to grow and then divide as they normally would during development, which leads to their large size. This leads to a reduced number of abnormally large RBCs and anemia.

Symptoms:

Laboratory Test Procedures:

numbness or tingling in the hands
numbness or tingling in the feet
fatigue
confusion
muscle weakness
forgetfulness
slow reflexes
loss of balance
unsteady walking
depression
dementia

Hemoglobin
Folic Acid (in red cell)
Folic Acid (in serum)
MCV
RBC
Hematocrit
Reticulocyte Count
Anisocytosis
Hypersegmented neutrophils
Urobilinogen (URINE TEST)
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