Pernicious Anemia Caused by a Lack of Intrinsic Factor Is

Question

Pernicious anemia caused by a lack of intrinsic factor is specifically treated by
A) oral doses of iron.
B) injections of iron.
C) oral doses of vitamin B12.
D) injections of vitamin B12.
E) blood transfusion.

Accepted Answer

Pernicious anemia caused by a lack of intrinsic factor is specifically treated by injections of vitamin B12. This is because the lack of intrinsic factor prevents the absorption of vitamin B12 from the gastrointestinal tract, therefore oral doses of vitamin B12 are ineffective. Injections allow for the vitamin to bypass the gastrointestinal tract and be absorbed directly into the bloodstream.