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A patient with a gastrectomy is at risk for which vitamin deficiency due to lack of intrinsic factor?

A.

Vitamin B12

B.

Vitamin K

C.

Vitamin C

D.

Vitamin A

Answer and Explanation

The Correct Answer is A

A. Vitamin B12: This is the specific vitamin that requires intrinsic factor (produced in the stomach) for absorption in the ileum.

B. Vitamin K: Vitamin K is synthesized by gut bacteria and absorbed with fats.

C. Vitamin C: Vitamin C is water-soluble and does not require intrinsic factor.

D. Vitamin A: Vitamin A is fat-soluble and does not require intrinsic factor.


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Related Questions

Correct Answer is C

Explanation

A. Chronic diarrhea: Diarrhea results in the loss of bicarbonate, which leads to metabolic acidosis.

B. Hypoventilation: Hypoventilation causes the retention of CO2, leading to respiratory acidosis.

C. Excessive vomiting: Vomiting results in the loss of hydrochloric acid (HCl) from the stomach. The loss of acid leaves the body in a relatively basic (alkaline) state.

D. Renal failure: In renal failure, the kidneys fail to excrete metabolic acids, typically leading to metabolic acidosis.

Correct Answer is B

Explanation

A. Vitamin B12 is stored in excess in the liver: Without intrinsic factor, the vitamin cannot reach the liver for storage.

B. Vitamin B12 is not absorbed and can lead to deficiency: Intrinsic factor is the "key" that allows Vitamin B12 to be absorbed in the ileum; without it, the vitamin passes through the GI tract and is excreted in feces.

C. Vitamin B12 is converted to its inactive form: The vitamin is not chemically inactivated; it simply remains in the lumen of the intestine because it cannot be transported across the membrane.

D. Vitamin B12 is excreted through the respiratory system: Vitamins are not gases and cannot be excreted via the lungs.

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