A 55-Year-Old Man Undergoing Evaluation for Fatigue and Exertional Dyspnea

A 55-year-old man undergoing evaluation for fatigue and exertional dyspnea is diagnosed with macrocytic anemia.  Upper gastrointestinal endoscopy is consistent with atrophic gastritis.  He is started on intramuscular cyanocobalamin, with the resulting changes shown in the graph below. The blue curve most likely corresponds to which of the following parameters?

A) Erythrocyte count
B) Gastrin
C) Haptoglobin
D) Methylmalonic acid
E) Reticulocyte count

Correct Answer:

Verified

Unlock this answer now
Get Access to more Verified Answers free of charge

Access For Free