A 48 year old patient presents to your clinic with complaints of progressive fatigue, shortness of breath on exertion, and occasional dizziness. On exam, she appears pale and has a resting HR of 102 bpm. Her CBC reveals Hb 8.9 g/dL, Hct 28%, MCV 74 fL, and a low reticulocyte count. Ferritin is borderline low, but she also has a history of chronic inflammatory arthritis. As an NP, walk through your clinical reasoning process for evaluating this patient: What are your differential diagnoses for her anemia and why? Which additional labs or diagnostic studies would you order, and why? What systemic or “hidden” causes of iron deficiency anemia must always be excluded, and how would this shape your workup? Based on your synthesis of data, how would you apply clinical judgment in determining whether to start empiric therapy, pursue GI evaluation for occult blood loss, or refer to hematology? Finally, how would you explain your reasoning and next steps to the patient in a way that balances clinical urgency with reassurance?