A client with end-stage kidney disease is at risk for anemia due to decreased production of erythropoietin. Which of the following conditions is most likely to contribute to anemia in end-stage renal disease?

Rationale:

A. Folate-deficiency anemia arises from insufficient folate (vitamin B9), which is necessary for DNA synthesis and red blood cell production. While inadequate folate intake can contribute, this type of anemia is more often associated with malabsorption syndromes, alcoholism, certain medications (like methotrexate), or increased requirements during pregnancy, rather than general poor nutrition in the population at large.

B. Sickle cell anemia is a hereditary disorder caused by a mutation in the beta-globin gene, producing hemoglobin S. This mutation causes red blood cells to become rigid and sickle-shaped, leading to hemolysis and vascular occlusion. Nutritional deficiencies do not cause sickle cell anemia, though adequate nutrition can help manage complications.

C. Pernicious anemia is caused by a vitamin B12 deficiency due to lack of intrinsic factor, a protein produced by gastric parietal cells that is required for B12 absorption. While dietary B12 intake can influence this condition, the primary defect is impaired absorption, not dietary insufficiency.

D. Iron-deficiency anemia is the most common nutritional anemia worldwide, resulting from inadequate iron intake, chronic blood loss (e.g., menstruation, gastrointestinal bleeding), or increased requirements (such as during pregnancy or growth spurts). Iron is a critical component of hemoglobin, the protein in red blood cells responsible for oxygen transport. Without sufficient iron, the body produces small (microcytic), pale (hypochromic) red blood cells, which cannot carry oxygen efficiently. This leads to hallmark symptoms such as fatigue, pallor, shortness of breath, dizziness, and decreased exercise tolerance. Iron-deficiency anemia is directly linked to dietary insufficiency and can be prevented or treated with iron-rich foods (e.g., red meat, leafy greens, legumes) and iron supplementation when necessary.

Rationale:

A. Thrombocytosis refers to an elevated platelet count, which can increase the risk of clot formation. It is unrelated to white blood cells and does not indicate infection or inflammation.

B. Neutropenia is a decreased number of neutrophils, a type of white blood cell, which can increase susceptibility to infections. This term represents a deficiency rather than an increase in white blood cells.

C. Anemia refers to a reduced number of red blood cells or decreased hemoglobin, leading to impaired oxygen delivery. It is unrelated to white blood cell counts or immune response.

D. Leukocytosis is defined as an increase in the total number of white blood cells (leukocytes), often in response to infection, inflammation, stress, or certain hematologic disorders. This increase is part of the body’s immune response, helping to fight pathogens and promote healing.