Peripheral Blood Smear Examination for Red Blood Cell Abnormalities
Purpose and Importance
- The peripheral blood smear examination is essential in the initial workup of any patient with suspected hematologic disorders, providing visual confirmation of red cell abnormalities 1, 2
Procedure and Methodology
- A thin layer of blood is spread on a glass slide, stained, and examined under a microscope by a qualified hematologist or pathologist 2
- The examination should be performed on fresh samples, as storage can affect cell morphology 3
Key Red Blood Cell Features Evaluated
- Size: Microcytic, normocytic, or macrocytic red blood cells can be identified 4
- Shape: Poikilocytosis, including target cells, teardrop cells, spherocytes, sickle cells, etc., can be detected 2
- Color/Hemoglobinization: Normochromic or hypochromic red blood cells can be identified, indicating hemoglobin content 4
- Arrangement: Rouleaux formation or agglutination patterns can be observed 5
Clinical Applications
- Identification of hemolytic processes: Presence of schistocytes suggests microangiopathic hemolytic anemia 6
- Spherocytes may indicate hereditary spherocytosis or immune-mediated hemolysis 1
- Detection of inherited RBC disorders: Characteristic morphologies can suggest specific genetic conditions like sickle cell disease, hereditary elliptocytosis, or enzyme deficiencies 7, 8
Limitations and Considerations
- Recent blood transfusions can affect the interpretation of results 8