Choose the correct answer: A middle-aged adult reports being…
Choose the correct answer: A middle-aged adult reports being unable to donate blood because because their “blood count was low”. This is a new lab finding for this individual. The blood bank advised the patient to follow-up with a healthcare provider. While providing the history, the patient reports using over-the-counter naproxyn (Naprosyn) daily for arthritis of the knees. The patient is otherwise healthy, eats well, and generally exercises 3-4 times weekly. In addition to a complete blood count, which of the following tests will be most helpful to include in the baseline evaluation of this patient?