A Clinic Nurse Is Working with a Patient Who Has

A clinic nurse is working with a patient who has a long-standing diagnosis of polycythemia vera. How can the nurse best gauge the course of the patients disease?

A) Document the color of the patients palms and face during each visit.
B) Follow the patients erythrocyte sedimentation rate over time.
C) Document the patients response to erythropoietin injections.
D) Follow the trends of the patients hematocrit.