A nurse is caring for a 45-year-old client diagnosed with vitamin B12 deficiency anemia who reports fatigue, weakness, and tingling in hands and feet. Which nursing intervention should the nurse prioritize?

Vitamin B12 injections are the priority intervention as they directly treat the deficiency, especially when absorption is impaired. Other options do not address the underlying cause.

Core Nursing Explanation Key Concept Analysis: This question assesses the priority nursing intervention for a client with Vitamin B12 deficiency anemia (Pernicious anemia). The key is understanding the pathophysiology: this type of anemia is not caused by a lack of iron or folic acid, but by a deficiency in vitamin B12, which is essential for DNA synthesis in red blood cells and for maintaining the myelin sheath around nerves. The symptoms of fatigue and weakness stem from the anemia, while the tingling (paresthesia) is a direct result of neurological damage (demyelination) due to the B12 deficiency. The most common cause in adults is Watch out for confusion! pernicious anemia, an autoimmune condition where the stomach lacks intrinsic factor, preventing B12 absorption from food. Therefore, oral B12 supplements are ineffective; the definitive treatment is parenteral (injected) B12.

Answer Rationale: Key Point! The priority intervention is to administer vitamin B12 injections as prescribed. This directly corrects the underlying deficiency, halts the progression of neurological damage (which can become irreversible), and begins to correct the anemia. In clinical practice and for the NCLEX, administering the prescribed treatment for the diagnosed condition is almost always a high-priority action, especially when it addresses both systemic and neurological symptoms.

Distractor Analysis:
• Watch out for confusion! Option 1 (Encourage iron-rich foods) is incorrect because it addresses iron deficiency anemia, not B12 deficiency. The anemias have different causes and treatments.
• Option 2 (Administer folic acid) is incorrect. While folic acid deficiency can cause a similar megaloblastic anemia, it does not cause the neurological symptoms (tingling). Furthermore, administering folic acid without B12 in a B12-deficient patient can mask the anemia while allowing neurological damage to progress, which is dangerous.
• Option 3 (Increase dietary fiber) is a non-priority, general health measure that does not address the acute deficiency or its symptoms. It is unrelated to the pathophysiology of B12 deficiency anemia.

Related Concepts: It's crucial to differentiate between types of anemia: Microcytic (Iron deficiency), Normocytic (Blood loss, chronic disease), and Megaloblastic (B12 or Folate deficiency). The presence of neurological symptoms is a key differentiator pointing directly to B12 deficiency.

Concept Summary • Pathophysiology: Lack of intrinsic factor → impaired B12 absorption → impaired DNA synthesis (causing megaloblastic anemia) and demyelination of nerves (causing neurological symptoms). • Classic Symptoms: Fatigue, weakness, pallor (anemia) + Paresthesias, gait disturbances, glossitis (neurological). • Definitive Treatment: Intramuscular (IM) or subcutaneous vitamin B12 injections (cyanocobalamin/hydroxocobalamin). High-dose oral B12 may be used in some cases but is not the standard for pernicious anemia. • Nursing Role: Administer injections, monitor for symptom improvement (hematological and neurological), provide long-term management education.

Side-by-Side Comparison!

Feature	Vitamin B12 Deficiency Anemia	Iron Deficiency Anemia
Primary Cause	Lack of intrinsic factor (autoimmune), malabsorption	Chronic blood loss, inadequate dietary intake
Red Blood Cell Size	Megaloblastic (Macrocytic) - Large	Microcytic - Small
Key Differentiating Symptom	Neurological: Paresthesia, ataxia, memory loss	None (may have pica - craving ice/dirt)
Treatment	B12 injections (lifelong for pernicious anemia)	Oral iron supplements, treat cause of blood loss

Anatomy, Physiology & Pharmacology Points • Intrinsic Factor: Secreted by parietal cells in the stomach. Binds to dietary B12 for absorption in the terminal ileum. • Schilling Test: Historical test for B12 absorption; largely replaced by serum B12 and intrinsic factor antibody tests. • Pharmacology: Cyanocobalamin is the common injectable form. Initial treatment is often frequent injections (e.g., daily or weekly), then monthly maintenance for life in pernicious anemia.

Memory Tips • B12 = Brain & Blood: Deficiency affects both (Neurological symptoms + Anemia). • Pernicious = Permanent Injections: Remember "P" for both. Lifelong injections are typically required. • Iron vs. B12: Think "Iron is for blood, B12 is for blood AND nerves."

High-Frequency NCLEX Topics NCLEX loves to test your ability to differentiate types of anemia based on symptoms and lab values and to select the correct, disease-specific intervention. The presence of neurological symptoms (tingling) is a huge red flag for B12 deficiency, making the answer choice about B12 administration the clear priority.

Watch Out for Question Variations! • Instead of asking for the intervention, a question might ask: "The nurse identifies paresthesia in a client with anemia. Which type of anemia should the nurse suspect?" (Answer: Vitamin B12 deficiency). • Or: "A client with pernicious anemia is prescribed oral iron supplements. What is the nurse's best action?" (Answer: Clarify the order with the provider, as oral iron does not treat pernicious anemia). • It could also test knowledge of Key Point! folic acid masking B12 deficiency: "The nurse understands that administering folic acid to a client with untreated B12 deficiency can lead to which complication?" (Answer: Progression of neurological damage).

Nursing Clinical Practice Guide Clinical Scenario: You are the nurse on a medical-surgical unit. Mr. Johnson, a 65-year-old, is admitted with complaints of worsening fatigue, unsteady gait, and "pins and needles" in his feet for several months. Lab work shows a low hemoglobin (Hb 8.2 g/dL), elevated MCV (Mean Corpuscular Volume) (110 fL), and a low serum B12 level. A diagnosis of pernicious anemia is confirmed.

Nursing Intervention Strategy: 1. Assessment: Perform a thorough neurological assessment. Document the location and severity of paresthesia. Assess gait and balance (risk for falls!). Monitor vital signs for tachycardia related to anemia. 2. Planning & Implementation: • Priority: Administer the first dose of IM vitamin B12 (cyanocobalamin) as prescribed. Common initial regimen: 1000 mcg IM daily for 1 week, then weekly for 1 month, then monthly for life. • Safety: Ensure correct injection technique (deep IM, typically ventrogluteal or vastus lateralis). Rotate sites. Monitor for rare allergic reactions. • Education: Teach the client that this is a lifelong treatment. Emphasize the importance of regular injections even after feeling better, to prevent irreversible nerve damage. Provide information on scheduling follow-up injections. 3. Evaluation: Monitor for improvement in energy levels and neurological symptoms over weeks to months. Follow-up labs will show a rising hemoglobin and a normalized MCV.

Patient Safety and Precautions: • Watch out for confusion! Never administer folic acid alone to a client with suspected B12 deficiency without also giving B12. • Implement fall precautions due to gait instability and weakness. • Be aware that a rapid correction of severe anemia can strain the cardiovascular system; monitor for signs of fluid overload or heart failure during initial treatment.

Nursing Procedure & Medication Flow Administering IM Vitamin B12 (Cyanocobalamin): 1. Verify the order: Drug, dose (e.g., 1000 mcg), route (IM), frequency. 2. Perform hand hygiene and don gloves. 3. Draw up medication. It is often a red-colored solution. 4. Select an appropriate IM site (ventrogluteal is preferred for adults). 5. Use a 1-1.5 inch, 21-23 gauge needle for deep IM injection. 6. Inject slowly. Massage the area post-injection is not typically recommended for B12. 7. Document the administration, site, and any patient response.

A Word from Your Senior Nurse "Remember, with B12 deficiency, we're treating more than just tired blood—we're protecting the nervous system. That tingling the patient feels is a cry for help from their nerves. Your prompt action in administering that B12 injection isn't just a task; it's preventing potentially permanent damage like numbness or paralysis. In clinical practice, you'll be the one to connect the dots between the lab values (high MCV), the symptoms (tingling feet), and the life-changing treatment. That's the power of nursing knowledge in action!"