The Nurses Brief Review of a Patients Electronic Health Record

The nurses brief review of a patients electronic health record indicates that the patient regularly undergoes therapeutic phlebotomy. Which of the following rationales for this procedure is most plausible?

A) The patient may chronically produce excess red blood cells.
B) The patient may frequently experience a low relative plasma volume.
C) The patient may have impaired stem cell function.
D) The patient may previously have undergone bone marrow biopsy.