A nurse is assessing a client with suspected vitamin B12 deficiency anemia. Which assessment finding is most characteristic of this condition?

Glossitis (smooth, red, painful tongue) is a classic and characteristic sign of vitamin B12 deficiency anemia, distinguishing it from other anemias. Other options like brittle nails, pallor, and fatigue are common in various anemias but not specific to B12 deficiency.

Core Nursing Explanation Key Concept Analysis: This question assesses your ability to identify the characteristic clinical manifestations specific to Vitamin B12 deficiency anemia. While many anemias share general symptoms like pallor and fatigue, B12 deficiency uniquely affects rapidly dividing cells, including those of the gastrointestinal (GI) tract and the nervous system, due to its role in DNA synthesis. The key is to differentiate the neurological and mucosal signs of B12 deficiency from the signs of other common anemias like iron deficiency.

Answer Rationale: Key Point! A smooth, red, painful tongue (glossitis) is a hallmark of vitamin B12 deficiency. This occurs because B12 is essential for the normal maturation of epithelial cells. Its deficiency leads to atrophy of the papillae on the tongue, resulting in the characteristic smooth, beefy-red appearance and pain. This finding is much more specific to B12 (and folate) deficiency than the other options.

Distractor Analysis:

• Option 1 (Brittle, spoon-shaped fingernails - Koilonychia): This is a classic sign of Watch out for confusion! iron deficiency anemia, not B12 deficiency. It results from impaired keratin synthesis due to low iron.
• Option 3 (Pale conjunctiva and nail beds - Pallor): This is a nonspecific sign of reduced hemoglobin seen in all types of anemia. It does not help differentiate B12 deficiency from other causes.
• Option 4 (Shortness of breath and fatigue): These are common systemic symptoms of anemia due to tissue hypoxia. Like pallor, they are present in many anemias and are not characteristic of B12 deficiency alone.

Related Concepts: Vitamin B12 deficiency also causes significant neurological symptoms due to demyelination of nerve fibers, such as paresthesias (numbness/tingling), ataxia (unsteady gait), and impaired vibratory and position sense. These neurological changes can be permanent if the deficiency is not corrected promptly. Pernicious anemia, an autoimmune condition that destroys gastric parietal cells, is a common cause of B12 deficiency because it prevents the absorption of intrinsic factor-B12 complexes.

Concept Summary

Concept	Key Points
Vitamin B12 Deficiency Anemia	Macrocytic (megaloblastic) anemia. Caused by malabsorption (e.g., pernicious anemia, Crohn's disease), dietary lack (veganism), or surgical resection. Affects GI mucosa and nervous system.
Characteristic Signs	Glossitis, neurological symptoms (paresthesias, balance problems), lemon-yellow tint to skin (from combined pallor and mild jaundice).
Diagnosis	Lab findings: Low serum B12 level, elevated mean corpuscular volume (MCV) >100 fL, hypersegmented neutrophils on peripheral smear. Schilling test (historical).
Treatment & Nursing	Lifelong intramuscular (IM) or high-dose oral B12 supplementation. Monitor for resolution of symptoms and hematologic response.

Side-by-Side Comparison!

Feature	Vitamin B12 Deficiency Anemia	Iron Deficiency Anemia
Type of Anemia	Macrocytic / Megaloblastic	Microcytic, Hypochromic
Key Lab Value	High MCV (>100 fL)	Low MCV ( 임상 시나리오 Nursing Clinical Practice Guide Clinical Scenario: You are a nurse in a primary care clinic. Mr. Johnson, a 68-year-old man, comes in complaining of increasing fatigue, "pins and needles" in his hands and feet, and a sore, burning sensation on his tongue. He mentions his diet is "regular" but he rarely eats meat. On assessment, his tongue appears smooth, shiny, and reddened. His gait is slightly unsteady. Nursing Intervention Strategy: Assessment: Perform a comprehensive assessment focusing on neurological function (vibratory sense with a tuning fork, Romberg test for balance), a detailed dietary history, and inspection of oral mucosa. Ask about family history of autoimmune disorders. Nursing Diagnosis: Potential diagnoses include Imbalanced Nutrition: Less Than Body Requirements related to vitamin B12 malabsorption; Impaired Oral Mucous Membrane related to glossitis; and Risk for Injury related to sensory and motor deficits. Planning & Implementation: Collaborate with the provider for diagnostic tests (CBC, serum B12, methylmalonic acid, intrinsic factor antibodies). Administer prescribed vitamin B12 injections (cyanocobalamin) via deep IM route, typically in the vastus lateralis or ventrogluteal muscle. Rotate sites. Provide oral care: Recommend soft, bland, cool foods; avoid spicy, acidic, or hot foods that irritate the tongue. Use alcohol-free mouthwash. Promote safety: Assess home environment for fall risks (throw rugs, poor lighting). Educate on using assistive devices if gait is affected. Patient Education & Evaluation: Educate that B12 therapy is typically lifelong. Teach self-administration of IM injections or arrange for home health if needed. Emphasize the importance of follow-up lab work to monitor response. Evaluate for reduction in glossitis pain, improved energy levels, and stabilization of neurological symptoms over weeks to months. Patient Safety and Precautions: Medication: B12 injections are very safe, but always use proper IM technique to prevent injury. Anaphylaxis is rare but possible. Neurological Monitoring: Document baseline neurological status meticulously. Some damage may be irreversible, so the goal is to prevent further progression. Dietary Counseling: For patients with pernicious anemia, dietary B12 will not correct the deficiency because they cannot absorb it. Counseling must focus on adherence to injections, not diet. Nursing Procedure & Medication Flow Administering Intramuscular Vitamin B12 (Cyanocobalamin): Verify: Check provider's order, drug, dose, and patient identity. Prepare: Draw up the medication (often 1000 mcg/mL). Use a 1-1.5 inch, 21-23 gauge needle. Site Selection: Preferred sites are vastus lateralis or ventrogluteal. Deltoid can be used for small volumes. Rotate sites with each injection. Administration: Use Z-track technique for ventrogluteal injections to prevent leakage and skin staining (a harmless but noticeable side effect). Inject deeply into the muscle mass. Document & Educate: Document site, dose, and patient tolerance. Educate on the treatment schedule (often daily/weekly initially, then monthly for life). A Word from Your Senior Nurse "Remember, as a nurse, you are often the first to notice these subtle but telling signs. A patient complaining of a 'weird feeling' tongue or unexplained balance issues might be written off as 'just getting older,' but connecting those dots to a possible B12 deficiency can be life-changing. It prevents irreversible nerve damage. In your studies and in practice, always think beyond the lab value. See the whole person—their symptoms, their diet, their function. That holistic view is what makes nursing so powerful." 핵심 개념 Glossitis — Inflammation of the tongue, often leading to a smooth, red, painful appearance; a classic sign of vitamin B12 or folate deficiency. Pernicious Anemia — An autoimmune condition causing destruction of gastric parietal cells, leading to intrinsic factor deficiency and malabsorption of vitamin B12. Megaloblastic Anemia — A type of anemia characterized by large (macrocytic), immature red blood cells due to impaired DNA synthesis, commonly caused by B12 or folate deficiency. Intrinsic Factor — A glycoprotein produced by gastric parietal cells that binds to vitamin B12, allowing for its absorption in the terminal ileum. Paresthesia — An abnormal sensation such as tingling, pricking, or numbness; a common neurological manifestation of vitamin B12 deficiency due to demyelination. 마이메르시로 국가고시 완벽 대비 기출문제와 상세 해설을 무료로. 내 약점을 분석하고 진도를 관리하며 더 똑똑하게 공부하세요. 무료로 시작하기 App Store Google Play 학습 참고용입니다. 실제 임상은 최신 지침과 소속 기관 프로토콜을 따르세요.