Vitamin B12 deficiency Quiz: Ace Your Exams

Get ready to dominate your medical and nursing exams by using our dynamic quizzes to elevate your knowledge and increase your confidence. Whether you're gearing up for the USMLE®, COMLEX®, or your next in-class assessment, Osmosis quizzes tackle key topics in pathology, diagnostics, and treatment approaches. By honing in on clinical readiness and decision-making, we make sure the knowledge you gain empowers you both in the classroom and in real-world practice. Jump in and supercharge your exam prep!

Learning videos

Flashcards

Expert reviewed

Spaced Repetition

Mobile app

Custom Quizzes

1 of 3

A 72-year-old man is brought to the emergency department by his partner for evaluation of confusion and frequent falls for the past week. He has been experiencing numbness in his hands and feet for the last month. He had an episode of urinary incontinence this morning which is not usual for him. He adopted a vegan lifestyle one year ago. Past medical history is significant for type II diabetes and coronary artery disease for which he takes metformin and simvastatin. Temperature is 37.0°C (98.6°F), pulse is 98/min, respiratory rate is 18/min, and blood pressure is 104/74 mmHg. Muscle strength is 4/5 in the upper and lower extremities. Romberg test is positive and there is decreased vibratory sensation in the feet bilaterally. Hyperactive reflexes are noted in all extremities and Babinksi response is upward. MRI of the cervical spine shows areas of high signal intensity in the posterior and lateral columns of the spinal cord. Vitamin B12 level is 98 pg/mL. Which of the following laboratory results is most likely to be seen?

Elimination tool

Choose an option:

Hemoglobin	MCV	Methylmalonic acid (reference range 0 - 400 nmol/L)	Homocysteine (reference range 5 - 15 μmol/L)
14.2 g/dL	92 fL	670 nmol/L	10 μmol/L

Hemoglobin	MCV	Methylmalonic acid (reference range 0 - 400 nmol/L)	Homocysteine (reference range 5 - 15 μmol/L)
18 g/dL	88 fL	642 nmol/L	98 μmol/L

Hemoglobin	MCV	Methylmalonic acid (reference range 0 - 400 nmol/L)	Homocysteine (reference range 5 - 15 μmol/L)
10.8 g/dL	108 fL	81 nmol/L	84 μmol/L

Hemoglobin	MCV	Methylmalonic acid (reference range 0 - 400 nmol/L)	Homocysteine (reference range 5 - 15 μmol/L)
9.8 g/dL	72 fL	598 nmol/L	81 μmol/L

Hemoglobin	MCV	Methylmalonic acid (reference range 0 - 400 nmol/L)	Homocysteine (reference range 5 - 15 μmol/L)
11.4 g/dL	104 fL	720 nmol/L	91 μmol/L