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General Medicine · Haematology
Sample itemA 60-year-old woman has macrocytic anaemia, a sore smooth tongue, tingling in both feet and loss of vibration sense. Serum vitamin B12 is low. Which treatment is most appropriate?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
D. Parenteral vitamin B12
Vitamin B12 deficiency with neurological involvement, as in subacute combined degeneration, needs parenteral B12, which bypasses the absorption defect of pernicious anaemia. Folic acid alone can correct the blood picture while the neurological damage progresses. Treatment is usually life-long when the cause is pernicious anaemia.
Option by option
A. Folic acid alone
Folic acid alone may improve the anaemia but allows the neuropathy to worsen.
B. Oral prednisolone
Steroids are not first-line for B12 deficiency, and replacement of the vitamin is required.
C. Oral iron
Iron corrects iron deficiency, which is not the problem in this macrocytic picture.
D. Parenteral vitamin B12 (correct)
Correct. Injected B12 replenishes stores and halts neurological deterioration.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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