Unraveling Hematology: Your FNP Board Prep Guide to Anemias, Coagulopathies, and More
Hematology · 6 min read · June 13, 2026
Hey future FNPs! As you gear up for your board exams, you're probably navigating a vast ocean of information. Hematology, the study of blood and blood-forming organs, often feels like one of the deeper, more intricate currents. But don't let it overwhelm you! We’re going to simplify the essentials, focusing on what you absolutely need to know to confidently answer those board questions. Let's dive in and demystify hematology together.
The Anemias: Your Board Exam Mainstay
Anemia is a reduction in the number of red blood cells (RBCs), hemoglobin (Hb), or hematocrit (Hct), leading to decreased oxygen-carrying capacity. It's a common condition you'll encounter in practice and a frequent topic on your boards. The key to understanding anemias for your exam is knowing how to classify them and recognize their distinct features.
Microcytic Anemias (MCV < 80 fL)
These are characterized by small red blood cells. The most common culprits are:
Iron Deficiency Anemia (IDA): This is the most common type of anemia worldwide. It results from insufficient iron to produce hemoglobin. Causes include chronic blood loss (menstruation, GI bleeding), inadequate dietary intake, and malabsorption.
- Clinical Presentation: Fatigue, pallor, glossitis (smooth, beefy red tongue), cheilitis (cracked corners of the mouth), pica (craving non-nutritive substances like ice or dirt), and koilonychia (spoon-shaped nails).
- Lab Findings: Low Hb, Hct, MCV, MCH, and ferritin. High TIBC (Total Iron Binding Capacity) and RDW (Red Cell Distribution Width). Serum iron is low.
- Treatment: Oral iron supplementation (e.g., ferrous sulfate) with vitamin C to enhance absorption. Address underlying cause.
Thalassemia: Genetic disorders causing abnormal hemoglobin production. They are common in individuals of Mediterranean, African, and Southeast Asian descent.
- Clinical Presentation: Varies from asymptomatic (thalassemia minor/trait) to severe anemia requiring transfusions (thalassemia major).
- Lab Findings: Low MCV (often very low, out of proportion to the anemia), normal iron studies. Hemoglobin electrophoresis confirms diagnosis.
- Board Pearl: If you see a patient with microcytic anemia and normal iron studies, think thalassemia! This is a classic board question differentiator.
Anemia of Chronic Disease (ACD): Often normocytic but can be microcytic. Associated with chronic inflammation, infection, or malignancy. The body sequesters iron, making it unavailable for RBC production.
- Lab Findings: Low Hb, Hct. MCV can be normal or low. Low serum iron, low TIBC, and normal or elevated ferritin (ferritin is an acute phase reactant).
Normocytic Anemias (MCV 80-100 fL)
These anemias have normal-sized red blood cells but a reduced number.
- Acute Blood Loss: Hemorrhage leads to a sudden drop in RBCs. Initially, MCV is normal.
- Anemia of Chronic Disease (ACD): As mentioned, often normocytic.
- Early Iron Deficiency Anemia: Before the cells become microcytic.
- Renal Failure: Kidneys produce erythropoietin, a hormone that stimulates RBC production. Impaired kidney function leads to decreased erythropoietin.
Macrocytic Anemias (MCV > 100 fL)
Characterized by large red blood cells. The main types are megaloblastic, caused by impaired DNA synthesis.
Vitamin B12 Deficiency (Cobalamin Deficiency): Essential for DNA synthesis and neurological function. Causes include pernicious anemia (autoimmune destruction of intrinsic factor), gastrectomy, Crohn's disease, and strict vegan diet.
- Clinical Presentation: Fatigue, pallor, glossitis, and neurological symptoms (paresthesias, gait disturbance, memory loss, dementia). These are unique to B12 deficiency.
- Lab Findings: High MCV, low B12 levels. May have elevated homocysteine and methylmalonic acid (MMA).
Folate Deficiency: Also essential for DNA synthesis. Causes include inadequate dietary intake (e.g., alcoholics, elderly), malabsorption, and increased demand (pregnancy).
- Clinical Presentation: Similar to B12 deficiency but without neurological symptoms.
- Lab Findings: High MCV, low folate levels. May have elevated homocysteine, but normal MMA.
- Board Tip: Remember the key differentiator: B12 deficiency has neurological symptoms; folate deficiency does not. Both have macrocytic anemia.
Coagulation Disorders: Understanding Bleeding and Clotting
Coagulation disorders involve problems with the blood clotting process, leading to excessive bleeding or clotting. Your boards will test your understanding of common conditions and their management.
Platelet Disorders
Idiopathic Thrombocytopenic Purpura (ITP): An autoimmune disorder where antibodies destroy platelets. Often follows a viral infection in children. In adults, it can be chronic.
- Clinical Presentation: Petechiae, purpura, epistaxis (nosebleeds), gingival bleeding. No splenomegaly.
- Lab Findings: Isolated low platelet count (often < 100,000/µL). PT/PTT are normal.
- Treatment: Corticosteroids are first-line. IVIG (intravenous immunoglobulin) or splenectomy for refractory cases.
Thrombotic Thrombocytopenic Purpura (TTP): A rare, life-threatening disorder characterized by a pentad of symptoms: thrombocytopenia, microangiopathic hemolytic anemia, renal failure, neurological symptoms, and fever.
- Lab Findings: Low platelets, schistocytes (fragmented RBCs) on peripheral smear, elevated LDH, indirect bilirubin. PT/PTT are normal.
- Treatment: Urgent plasma exchange.
Clotting Factor Disorders
Hemophilia A (Factor VIII Deficiency) & Hemophilia B (Factor IX Deficiency): X-linked recessive disorders, primarily affecting males. They cause spontaneous or prolonged bleeding.
- Clinical Presentation: Deep tissue bleeding (hemarthrosis – bleeding into joints), muscle hematomas, prolonged bleeding after trauma or surgery.
- Lab Findings: Prolonged aPTT (activated partial thromboplastin time), normal PT, normal platelet count. Specific factor assays confirm diagnosis.
- Treatment: Factor replacement therapy.
Von Willebrand Disease (vWD): The most common inherited bleeding disorder. It affects both platelet adhesion and factor VIII activity.
- Clinical Presentation: Mucocutaneous bleeding (epistaxis, menorrhagia, easy bruising, prolonged bleeding after minor cuts).
- Lab Findings: Prolonged bleeding time, often prolonged aPTT (due to low Factor VIII). Normal platelet count. Diagnosis confirmed by vWF antigen and activity levels.
- Treatment: Desmopressin (DDAVP) for mild cases, factor VIII/vWF concentrate for severe cases.
Disseminated Intravascular Coagulation (DIC): A serious, life-threatening condition where widespread activation of coagulation leads to consumption of clotting factors and platelets, resulting in both thrombosis and hemorrhage.
- Causes: Sepsis, trauma, malignancy, obstetric complications.
- Lab Findings: Prolonged PT, aPTT, and bleeding time. Low platelet count, low fibrinogen, elevated D-dimer (indicates fibrinolysis).
- Treatment: Treat the underlying cause. Support with blood products as needed.
Polycythemia Vera: Too Many Red Cells
Polycythemia Vera (PV) is a myeloproliferative neoplasm characterized by overproduction of all myeloid cell lines, especially red blood cells. It's often associated with a JAK2 V617F mutation.
- Clinical Presentation: Headache, dizziness, blurred vision, pruritus (especially after a warm bath – aquagenic pruritus), erythromelalgia (burning pain and redness in hands/feet), splenomegaly, and a ruddy complexion.
- Complications: Increased risk of thrombosis (clots), leading to stroke, MI, DVT, PE.
- Lab Findings: Elevated Hb, Hct, WBC, and platelets. Low erythropoietin levels (due to negative feedback from high RBC count). Positive JAK2 mutation.
- Treatment: Phlebotomy to maintain Hct < 45%, low-dose aspirin to prevent thrombosis. Hydroxyurea may be used to suppress cell production.
- Board Pearl: Remember the classic PV patient: a middle-aged individual with a ruddy complexion, pruritus after bathing, and elevated Hct. The low erythropoietin is a key lab finding.
Key Takeaways for Your Boards
- Anemias: Focus on classification (microcytic, normocytic, macrocytic), key lab findings (MCV, ferritin, TIBC, B12, folate), and unique clinical presentations (e.g., neurological symptoms in B12 deficiency, pica in IDA).
- Coagulopathies: Differentiate between platelet disorders (petechiae, normal PT/PTT) and clotting factor disorders (deep bleeding, prolonged PT or PTT). Know the common inherited conditions like Hemophilia and vWD.
- Polycythemia Vera: Recognize the classic symptoms, lab findings (high Hct, low EPO, JAK2 mutation), and primary treatment (phlebotomy).
Feeling prepared and confident is half the battle for your FNP boards. By breaking down complex topics like hematology into manageable, board-relevant chunks, you're building a strong foundation. You've got this! Keep reviewing, keep practicing, and trust in the knowledge you're gaining.
Ready to solidify your knowledge and conquer your FNP boards? Visit The FNP Review for expert-led content, practice questions, and comprehensive study materials designed to help you succeed.