Iron Deficiency Anemia - Nursing Care Management

When iron stores fall too low to support red cell production, hemoglobin drops and oxygen delivery suffers. On the floor you see the fatigue, pallor, and listlessness, but the real job is finding the source (usually bleeding or diet), replacing iron correctly, and teaching families to stick with therapy long after symptoms ease. Iron deficiency is the most common single nutritional deficiency worldwide.

What It Is

Iron deficiency anemia develops when body iron stores drop too low to support normal red blood cell (RBC) production. Iron deficiency means decreased total body iron content; it becomes anemia once the deficiency is severe enough to diminish erythropoiesis. The body normally regulates iron balance so absorption matches losses.

Pathophysiology

Iron is essential for oxygen transport, DNA synthesis, and electron transport. Body iron is regulated carefully so absorption compensates for losses, though loss itself is a more passive process than absorption. In healthy people total body iron concentration (about 60 parts per million, ppm) is controlled by absorptive cells in the proximal small intestine, which adjust uptake to match losses. Persistent errors in this balance lead to iron deficiency anemia or hemosiderosis, both with potentially serious consequences. Iron uptake in the proximal small bowel occurs by 3 pathways: the heme pathway and 2 distinct pathways for ferric and ferrous iron. Heme iron is not chelated and precipitated by the dietary constituents that render nonheme iron nonabsorbable (phytates, phosphates, tannates, oxalates, and carbonates).

Statistics and Incidences

In North America and Europe, iron deficiency is most common in women of childbearing age and reflects hemorrhage. Depending on diagnostic criteria, about 4 to 8% of premenopausal women are iron deficient. A primary-care database study across Italy, Belgium, Germany, and Spain found annual incidence rates of iron deficiency anemia ranging from 7.2 to 13.96 per 1,000 person-years, with higher rates in females, younger and older persons, patients with GI disease, pregnant women, women with a history of menometrorrhagia, and users of aspirin or antacids. Infants on cow milk have higher incidence because bovine milk's higher calcium competes with iron for absorption. During the childbearing years an adult female loses an average of 2 mg of iron daily and must absorb a similar amount; because she typically eats less than the average man, she must be more than twice as efficient at absorbing dietary iron to stay in balance.

Causes

Diet matters: meat supplies heme iron, which resists the constituents that cut nonheme bioavailability, so iron deficiency anemia is low where meat is common and frequent where it is sparse. Hemorrhage from any cause depletes iron and, with enough loss, produces anemia. Iron can also be lost in the urine (hemosiderinuria, hemoglobinuria, pulmonary hemosiderosis); if a fresh urine specimen looks bloody but has no red cells, suspect hemoglobinuria. Malabsorption occurs with prolonged achlorhydria, since acid is needed to release ferric iron from food so it can be kept soluble for absorption in the more alkaline duodenum. Iron-refractory iron deficiency anemia (IRIDA) is a hereditary disorder typically unresponsive to oral iron and only partially responsive to parenteral iron.

Clinical Manifestations

Children with iron deficiency anemia are often below average body weight, since they consume more milk and calcium than other nutrients. Skin and mucous membranes lose their rosy color as hemoglobin falls. Anorexia is common when milk is the main food. Growth becomes stunted as intake of other foods drops, and the child grows listless and weak as less oxygen reaches the brain.

Assessment and Diagnostic Findings

History and exam help establish the cause, but this is primarily a laboratory diagnosis. The CBC documents severity; in chronic iron deficiency anemia the indices show microcytic, hypochromic erythropoiesis, with both MCV and MCHC below the lab's normal range. The peripheral smear shows microcytic, hypochromic RBCs, and microcytosis appears long before the MCV falls. Low serum iron and ferritin with an elevated TIBC are diagnostic; low ferritin is virtually diagnostic, though normal ferritin can occur with coexistent disease (hepatitis or anemia of chronic disorders). Hemoglobin electrophoresis with hemoglobin A2 and fetal hemoglobin helps identify beta-thalassemia or hemoglobin C or D. Reticulocyte hemoglobin content (CHr) aids diagnosis in children with or without anemia. Stool testing for hemoglobin establishes GI bleeding as a cause. On incubated osmotic fragility, microspherocytosis may give a low-normal or slightly abnormal MCV, but the MCHC is usually elevated rather than decreased and the smear lacks central pallor rather than showing hypochromia. Measure tissue lead concentrations; chronic lead poisoning can cause mild microcytosis. A bone marrow aspirate can be diagnostic: absence of stainable iron in a spicule-containing aspirate, with a control specimen that does contain stainable iron, confirms iron deficiency without further testing.

Medical Management

Start by establishing the diagnosis and the reason for deficiency. Oral ferrous iron salts are the most economical and effective treatment, and ferrous sulfate is the most commonly used. Surgical management stops hemorrhage and corrects the underlying defect so it does not recur, which may mean surgery for neoplastic or nonneoplastic disease of the GI tract, GU tract, uterus, or lungs. Adding nonheme iron to national diets has begun in some parts of the world.

Pharmacologic Management

Iron products supply iron for hemoglobin synthesis and replenish stores. Reserve parenteral iron for patients who cannot absorb oral iron or whose anemia worsens despite adequate oral doses; it is expensive and carries greater morbidity than oral preparations.

Nursing Management

Nursing Assessment

Take a dietary history: vegetarians are more likely to develop deficiency without supplementation, and national supplementation programs exist where meat is sparse. Ask about hemorrhage, the most common cause, whether from parasitic infection (hookworm) or other blood loss; bleeding from most orifices (hematuria, hematemesis, hemoptysis) usually presents before chronic anemia develops, but GI bleeding can go unrecognized. On exam, look for pallor of the mucous membranes and epithelial changes associated with iron deficiency: esophageal webbing, koilonychia, glossitis, angular stomatitis, and gastric atrophy.

Nursing Diagnosis

• Fatigue related to decreased hemoglobin and reduced oxygen-carrying capacity.
• Deficient knowledge related to treatment complexity, lack of resources, or unfamiliarity with the condition.
• Risk for infection.
• Risk for bleeding.

Nursing Care Planning and Goals

• Client or caregivers verbalize and use energy-conservation principles.
• Client or caregivers report reduced fatigue, with increased energy and ability to perform desired activities.
• Client or caregivers understand the disease and treatment plan.
• Client has reduced infection risk (no fever, normal WBC count, preventive measures such as proper handwashing).
• Client has vital signs within normal limits.
• Client has reduced bleeding risk (normal or adequate platelets, no bruises or petechiae).

Nursing Interventions

Administer prescribed medications: give IM or IV iron when oral iron is poorly absorbed, and do sensitivity testing on IM iron to avoid anaphylaxis. Advise taking iron an hour before meals for maximum absorption; if gastric distress occurs, take it with meals and return to between-meals dosing once symptoms subside. Tell the patient iron salts turn stool dark green or black, and to take liquid iron through a straw and rinse the mouth with water afterward.

Reduce fatigue: help build a daily schedule of activity and rest, stress frequent rest periods, monitor hemoglobin, hematocrit, RBC count, and reticulocytes, teach energy conservation, and encourage continuing iron therapy for the full course (6 months to a year) even after fatigue resolves.

Educate: explain the diagnostic procedures (CBC, bone marrow aspiration, possible hematology referral), the importance of iron replacement, and iron-rich foods (organ and other meats, leafy green vegetables, molasses, beans).

Prevent infection: assess for local or systemic signs (fever, chills, swelling, pain, malaise), monitor WBC count and anticipate antibiotic, antiviral, or antifungal therapy, have the client avoid people with active infections, and stress daily hygiene, mouth care, and perineal care.

Prevent bleeding: monitor platelet count and teach bleeding precautions, anticipate platelet transfusion if the count drops very low, and check the skin for bruises and petechiae.

Evaluation

Goals are met when the client or caregivers use energy conservation and report reduced fatigue, understand the disease and plan, show reduced infection risk with no fever and normal WBC count, have vital signs within normal limits, and have reduced bleeding risk with adequate platelets and no bruises or petechiae.

Documentation Guidelines

Document baseline and subsequent assessment findings including signs and symptoms, cultural or religious restrictions and preferences, plan of care and people involved, teaching plan, responses to teaching and interventions, progress toward outcomes, and long-term needs with responsible parties.